After your match ends, tap the "Report the score" notification, then tap Report score. If you've closed it, find it again under the bell icon on the Profile tab. Only one player needs to report.
Report the score
Tap the notification "Report the score from your recently played match". If you've closed it, open the Profile tab, tap the bell icon at the top right and tap the notification there. Then tap Report score on the match.
Under Was this match played?, tap Yes.
Enter the games for each set.
Tap Continue.
Check the score and tap Submit Score.
Rate the other players' level as As expected, Higher or Lower, then tap Continue.
The other team is then asked to confirm the score.
If the match wasn't played
Tap No under Was this match played? and tap Confirm. Nothing changes on anyone's level.
If the match wasn't finished
Enter the games as they stood when you stopped. See "What happens if our match wasn't finished?".
Good to know
You can report a score for public, private and league matches, but not for a court booking.
Report score appears once the match has ended.
You can enter up to 3 sets. The third set can be a tie-break to 10.
Only one score can be reported for each match.