HaloMods "Classic" Read-only Archive

I have spark edit but i dont know how to place vehicles in a map that didnt have vehicles. can someone help me?

This Tutorial will show you how to put a vehicle in Boarding Action
1)Open HMT
2)Open Boarding Action
3)scroll down to vehicles
4) select the first vehicle
5)look at the top of the window and there will be 3 boxes,the first being labeled: vehi, the second: unit, the third: obje. change it to this 1:Scen, 2:obje, 3:

was i supposed 2 do the hmt part all at once? cause i only did the worthogand now i cant get back 2 the map file with hmt but both halos and sparkedit work fine