Retractable landing gear

Hello all. I come in search of help. I have a set of retractable landing gerar (Hobbypower TL65B44) I’m trying to get to work. I can get them to move with a servo tester. I went thru the docs set up page several times, with no luck. I have a pixhawk 2.4.8 and AC3.5.7. If anybody has any tips, would appreciate it.

Ok, so this morning I installed ardusub and then installed arducopter 3.6. Went thru all the set up again and landing gear still won’t work.