How do you select an MF

Honestly, I took the laziest of the lazy approach, my pension MFs are defined by the pension company/insurance. I can tell them what profile I want, from lowest of lowest risk (bonds incl state bonds + interest given assets) to highest risk (stocks incl emerging countries and such), and some profiles in between. Same thing for my mortgage. Every few years I review this, planning to change profiles, but never really do this. Most are in the highest risk profile they offer, which is still kinda safe.