JordanIt's not possible within the user interface of the app.
However, if you're in the thread and tap the title in the section immediately below the black bar at the top of the screen, you'll be taken to the "full" web version of your post. You can then tap the Edit button, the "Go Advanced" button, then edit the title on that page.
JordanMaybe, but it could be a while due to issues with the platform I use to power the forum section of the app. It's really just there at the moment to provide basic mobile functionality for the site and not to be a total replacement for it.