...

In order for a form to show up, you need to (1) have the form installed on your site, and (2) add a form association and "Associate" that form with the specific Content Model you will use it with.

How to Copying an Existing Form That is Already on Your Islandora Site

When creating a new form, it is best to start by copying from an existing form, especially one already associated with the content model you plan to use the new form with.  In general, it is easier to shorten an existing form by deleting form fields and elements, than it is to add new form fields and elements.  Even without knowing XPath/XSLT, you can shorten a form and set up a workflow on your site which involves only seeing the fields you need to fill in.  This can save significant time for people uploading content and clicking through the form on each upload.

...