Read the manual all looks self explantory.

Only bit not sure about is on the oil volumes for springs side (Solo Air). In the volume sit states 6ml of 15wt oil , but reading the instruction it doesnt mention where to put this

My guess is tip this in the top and then screw down the top cap?

If they’re the new model then https://www.sram.com/sites/default/files/techdocs/gen0000000004392_rev_a_rockshox_oil_air_and_coil_chart_2014_0.pdf might help, other years are on the rock shox service website. That seems to suggest no oil in the upper spring side though…