If you cannot edit your ads, it is possible your browser popup blocker is activated and preventing you from viewing our editing tools. When you click on the edit (pencil) button located adjacent to an ad, you should be able to see one row of tools, with heading above it that reads, "Overall Text Alignment" and a text box at the bottom of the page.
If you don't see any of these, it is very possible your browser popup blocker is getting in the way. Disable it for our site, and you should be able to view the page properly and make changes to ads right away.