You first need to enable referees in the system.

Do this by going to Setup > Settings > then use the 'Roles' tab.
Then tick the checkbox for the referee / official role.

You then need to create some people and add the referee / official role to them.
Do this in People > List People > Referee
then press the 'Create New' button

Add their details, select their role to be a referee / official and check the box to send them an invite so they can create their own login, then press create.

You should then be able to add this referee to a match by going to:
Referees > Assignment

Here you will see a list of matches where you can assign referees / officials to the match.

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