I can't see a backup button

I’ve read through the forum and can’t find an answer to this. The app seems to load OK, comes up with an indexing message, and then shows me internal memory files and dropbox space. But there is no backup button or question mark to be found. There is a square icon in the top right hand corner, looks something like it might be settings, but it dousn’t respond to touch.

I am using an Asus transformer, the android version.

Any help would be appreciated.

OK, I uninstalled and reinstalled the app, but that makes no difference. There is still no backup button.

If I go into Internal Memory and find an app that I’d like to backup and long-press it, I only get a box with the option to Uninstall of Manage Application, neither of which is going to back it up. 

Am I wasting my time with this App, or can someone give me a clue as to what to try next?