To create a new idea, select that option from either the main options menu or the right side options menu.

This takes you to a page with a form where you can fill in the idea title, a url (if there is one), select the category (or do not place in a category), and type or copy/paste an idea into the editing box. Once you've filled in all this information, click the "Save Idea" button at the top or bottom of the page.
