Help accessing a player persistent variable in a procedure

I probably just can’t find the right block to do this. I am making a mod with a mana bar, the bar is fully functional but I can’t get the mana weapons to use the player persistent variable for how much mana the player has. The code is triggered when the mana weapon is right clicked and everything worked well until I added the check for enough mana. I think what goes wrong is that I don’t know how to reach the right variable, is there any way to do this.