You need an adapter (shown in link) then fill like a normal fill station.

People generally fill cylinders by going to a dive shop or through your club. You can find diving clubs and diving shops in a number of directories or on-line. Some dive centres like the National Diving and Activity Centre also have filling stations. If you have a certified cylinder that is in date, you will find it easy to get a fill. If your cylinder is not in date it may be dangerous to fill. Most clubs have compressors and you will also find there are lots of divers like myself who have their own diving compressor who may be able to help you out.

Oxygen is not known as helium.

But a mixture of oxygen and helium is used in the oxygen cylinder for underwater diving.

It is diving on a high diving board.

Diving mask, demand valve of the diving regulator, buoyancy compensator inflation and vent valves and depth guage.

An alternate buoyancy compensator vent valve and shoulder straps of the BCD, which can be released by another diver in case of emergency

Crutial that�s not mentioned� the contents gauge displaying remaining pressure in the diving cylinder - showing 150 bar