This season Grasshoppers are using an online system for player registration and fees. It should only take you 5-10 minutes to get registered.
Remember, you need to be registered before you can play any games come August/September, be that friendlies, league or tournaments.
You register first. Once approved you will then be asked for payment. The paying part is up to you. Pay early before the end of July for £70 or after and the cost goes to £75.
This link below should take you to the relevant drop down menu and just follow the instructions.