Form success field not showing in admin

Have added Forms app to Runway.

Have successfully added basic contact form which submits fine. This uses contact.html template in in templates/forms.

However I do not see the Thank you message textarea as a region in admin area. If I add text in the perch:success tag itself in the html template I get that echoed on page when form submits.

<perch:success>
        <perch:content id="success" type="textarea" label="Thank you message" textile="true" editor="markitup" show-form="true" />
Success!
    </perch:success>

How do I get the Thank you message textarea to show as editable region in admin?

<perch:form id="contact" method="post" app="perch_forms">

    <div class="form-group">

    <perch:content id="intro" type="textarea" label="Intro" textile="true" editor="markitup" size="m" class="form-control" />

    <div>
        <perch:label for="name">Name</perch:label>
        <perch:input type="text" id="name" required="true" label="Name" class="form-control" />
        <perch:error for="name" type="required">Please add your name</perch:error>
    </div>

    <div>
        <perch:label for="email">Email</perch:label>
        <perch:input type="email" id="email" required="true" label="Email" placeholder="you@company.com" class="form-control" />
        <perch:error for="email" type="required">Please add your email address</perch:error>
        <perch:error for="email" type="format">Please check your email address</perch:error>
    </div>

    <div>
        <perch:label for="message">Message</perch:label>
        <perch:input type="textarea" id="message" required="true" label="Message" class="form-control" />
        <perch:error for="message" type="required">Please add a message</perch:error>
    </div>

    <div>
        <perch:input type="submit" id="submit" value="Send" class="btn btn-primary" />
    </div>

    <perch:success>
        <perch:content id="success" type="textarea" label="Thank you message" textile="true" editor="markitup" show-form="true" />Success!
    </perch:success>

    </div>

</perch:form>

Debug Message
[24] SELECT p.pagePath, pr.routePattern, pr.routeRegExp, p.pageTemplate FROM sqhc_pages p LEFT JOIN sqhc_page_routes pr ON p.pageID=pr.pageID ORDER BY pr.routeOrder ASC, p.pagePath ASC
Matched page: /contact, so not using routes.
Using master page: /templates/pages/contact.php
[1] SELECT * FROM sqhc_pages WHERE pagePath='/contact' LIMIT 1
Using template: /templates/pages/attributes/default.html
Using sub-template: /templates/pages/attributes/seo.html
[10] SELECT * FROM sqhc_pages WHERE pageNew=0 AND pageHidden=0 ORDER BY pageTreePosition ASC
[1] SELECT pageTreePosition FROM sqhc_pages WHERE pagePath='/contact' LIMIT 1
[1] SELECT pageID FROM sqhc_pages WHERE pageTreePosition IN ('000-011', '000') ORDER BY pageTreePosition DESC
Using template: /templates/navigation/item.html
[4] Using template: /templates/navigation/item2.html
[4] Using template: /templates/navigation/item2.html
[3] SELECT regionKey, regionHTML FROM sqhc_content_regions WHERE regionPage='/contact' OR regionPage='*' ORDER BY regionPage DESC
[24] SELECT DISTINCT settingID, settingValue FROM sqhc_settings WHERE userID=0
Using template: /templates/forms/contact.html
[1] SELECT groupID FROM sqhc_navigation WHERE groupSlug='footer-nav' LIMIT 1
[3] SELECT np.pageID, np.pageParentID, p.pagePath, p.pageTitle, p.pageNavText, p.pageNew, p.pageOrder, np.pageDepth, p.pageSortPath, np.pageTreePosition, p.pageAccessTags, p.pageAttributes FROM sqhc_navigation_pages np, sqhc_pages p WHERE p.pageID=np.pageID AND np.groupID=3 AND p.pageNew=0 ORDER BY np.pageTreePosition ASC
[0] SELECT np.pageTreePosition FROM sqhc_pages p, sqhc_navigation_pages np WHERE np.pageID=p.pageID AND np.groupID=3 AND p.pagePath='/contact' LIMIT 1
[3] Using template: /templates/navigation/footer-item.html
[1] SELECT pageID, pageParentID, pageDepth, pageTreePosition FROM sqhc_pages WHERE pagePath='/contact' OR pageSortPath='/contact' LIMIT 1
[1] SELECT * FROM sqhc_pages WHERE pageID=0 LIMIT 1
[4] SELECT * FROM sqhc_pages WHERE pageNew=0 AND pageHidden=0 AND pageDepth >=0 AND pageDepth<=1 ORDER BY pageTreePosition ASC
[1] SELECT pageTreePosition FROM sqhc_pages WHERE pagePath='/contact' LIMIT 1
[1] SELECT pageID FROM sqhc_pages WHERE pageTreePosition IN ('000-011', '000') ORDER BY pageTreePosition DESC
Request time: 0.1139
Process time: 0.1117
Memory: 4.8805

Thanks Keith