A match you are refereeing appears on your profile as soon as the Owner names you as its referee. There is nothing to accept and nothing to set up.
Before you start
You have to be a referee already - see Becoming a referee, and your referee profile - and the match's Owner has to have named you as its referee. Being a Scoryboard referee does not put you on any match by itself.
Where your matches are
Open your own profile. It opens on the referee side, and REFEREED MATCHES shows your next fixture. Your name is in the referee row of the card.
Select See All at the top right of the panel for every match you referee. The panel itself only shows the next one.
Select Past Matches for the matches you have already refereed. Each card carries the final score instead of the kick-off.
Select Add to Calendar on any upcoming card to put the kick-off in your own calendar.
Your matches in a month
Select Schedule in the sidebar. The calendar shows every match you are on, including the ones you referee, next to everything else in your month.
Use the arrows beside the dates to move month by month. A fixture months away is on the calendar long before it is your next one.
Which tournaments added you
Select Tournament in the sidebar. Every tournament that added you as a referee is in the list, badged Referee.
This is the quickest way to see who made you a referee.
If you see no matches
No matches yet, stay tuned! means you are a referee and are not on a fixture yet.
Being added to a tournament and being named on a match are two separate things. An organiser does the first; the match's Owner does the second, one match at a time.
If it does not work
You know about a match but it is not in your list. The Owner has not set you as its referee. Ask them to open the match, select the gear, choose Edit, and set Referee. See Assigning a referee, and adding a banner or note.
A match you are refereeing is under Upcoming Matches but it has already started. Upcoming means "not finished". A match that is being played sits there too.
Your profile shows a player's statistics, not a referee's. Your profile is on the football side. Select Referee on the switch at the top right.
Schedule looks empty. Check the month. The calendar opens on this month, and your fixture may be in another one.
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