To do this, find the club you wish to register a profile to on CricHQ and select "Register Now". You will then be presented with a list of all the profile you are able to register to the club. This will include yourself and any other profiles you are a guardian of. You can then select the profile you wish to use.
You can then follow this same process for as many clubs as your require. In no way are users restricted to register all players to only one club.