Can't save vertex group with ManuelBastioniLAB

just started to use ManuelBastioniLAB but I can’t seem to figure out a way to save vertex group, eveytime I set up one, next time I reopen the file, it’s gone, am i missing anything?

You may have to click the “Finalize Character” button in the Maniel BastioniLAB settings before making these kinds of adjustments.