XF 1.1 Extend Profile Page sections

Sorry if this is a simple question for some of you, but I'd like to extend the profile Information tab with one or more sections, so I can group several Custom User Fields together.


So next to About and Interact, I'd like "Contact details" and "Specialities". Preferably phrased.

I assume this is possible and maybe even quite easy to do, but I don't know where to start looking...