1. Click on 'Blog' button in the right-hand sidebar
2. Add your page content (i.e. your text which you can format, images using 'Add image' and create links) using the tools in the Tiny MCE.
3. Click the 'HTML' button once you've added all your content
4. Copy and paste the contents of the pop up window - this is your HTML code
5. Paste this code in to the 'Edit Page Content' section of tab you wish to edit.
6. Save your changes, and you will have updated your tab's content!