How to rig model

[AdriiRozayXOXO]

How do I rig my model so far I did in this order:

1. Export lowr_003_r from mpstunt dlc vanilla to .odd
2. Export .skel file from x64v freemode_f and rename to lowr_003_r FULL.skel
3. Import vanilla lowr_003_r .odd from mpstunt vanilla ito 3dsmax
4. Imported .odd of edited pants with .skel file into 3ds
5. ctrl A + attached vertexes to new model One in pic and deleted the old model
6. Exported to open format and import open format to openiv mod files and it's still glitched

As far as I know all steps are correct