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Fill the reservoir up with engine oil, put the piston back in, then sloooowly squeeze the tensioner with a vise or C-clamp. As you tighten the vise, the air will come out of the bleed at the top of the piston. Put a catch can underneath to catch the drippings.
The other method is to assemble everything, then add oil through the oil feed port, using a hand held oil can (or anything else that can add a little pressure while filling with oil). Keep going until you see the oil coming out of the air bleed.
Or just assemble everything in the engine and start it up. It'll have enough oil pressure to quiet down any noises in less than a second if the engine was primed before starting (assuming new tensioners and not some crusty grimy old ones).
I put in a LOT of tensioner kits just doing the latter and never had a problem.
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