I can't levelup?

I have more than enough points to level, but there does not appear to be any method to level.

I followed the displayed hint "Click on Player portrait", but nothing happens. Player screen appears but no discernable way to activate.

I am very new and am probably missing the very obvious! Help/advice appreciated!

Hit the plus sign on the character on the bottom of the screen where the portrait is..

click on small plus sign on top right corner of portrait