Add Embed Code
In your ShowIt Editor, click the middle + icon and select Embed Code.
A blank embed code element will appear. Paste this code into the Custom Code box under Embed Info.
Open POWr Editor
Preview your site, and you'll see a new POWr Membership Form. Click the blue Edit button to open the POWr Editor.
Click Next to move through the POWr Editor, then Save your plugin.
If you don't have a POWr Account already, you'll be prompted to create one.
(don't worry, it's free)