Just click on "Add Balsamiq Mockups" and edit your mockups.
Mockups allows you to add UI wireframes to your wiki pages. Improve your software or website's usability, cut down spect-writing time and get to a consensus early with a tool that everyone can use.
Just click on "Add/Edit UI Mockup to this issue", edit your mockup, name it and save. The UI wireframe will show up as an attachment on the issue, both as an image and as clean, human-readable, reusable, versioned XML data.