Will try the following in order to assign right lever to flaps
I only fly cessna 172 - so dont need to worry about creating asssignments for different aircraft I fly
1 delete what I have from screen pic for decrease and increase lever assignments
2 centre right lever - so its neither up or down
3 click on search by input
4 move right lever down for velocity one flightstick
5 see what I get for search result - probably joystick axis 5 - could be something else
6 assign flap axis to joystick axis 5 - or whatever search result I get
This should hopefully do the trick