Help Needed Registering Players

Just a raw newbie playing the aussie league, when i buy foriegn players i can't play them until they are registered, but can't work out how to do this, can anybody please help

dont play aussie league

You usually has to register players at the start of the season. But different leagues has different rules.

Even thou im aussie im not sure about the A-League (cos its shit lol) but i think your only allowed a certain amount of foreign players per team. But i could be wrong.