Stuck on the welding bottles

Something needs to be attached to the welding bottles (I think).

I have:
matches
rope
pressure gauges (2/2)
weld pipes (2/2)
pliers
welding torch
yellow test tube

I can't attach any of these to the gas bottles. What am i doing wrong?

you need the 2 gelding hoses. You'll have to go hunting again to find them