Instructions should be in the modx file at the bottom. I copy and pasted it below
Click on System -> User Control Panel -> Profile.
From the Add Module dropdown on the bottom right, choose the Edit Favorites and View Forum Favorites modules and add them, then click on Enable for each.
Links will now show up in the UCP under Profile.
Similarly you need to install the ACP module. Go to System -> Administration Control Panel. You can add the links to an existing category or create a new one
(I recommend General -> Board Configuration or General -> Forum Favorites). Add the Forum Favorites Settings and Edit Favorites Categories modules and Enable them.
You now need to use the ACP module to set up your categories and some inital settings before the mod can be used by users.
Code work on the next version is all done, I just need to test install it on a clean phpbb to make sure I didn't forget to include anything in the file. Should be up tonight or tomorrow.