To accept Monero transaction you have to go to "Receive" tab, click on "Accept" button.
Enter Transaction ID (example: af4a02da87cb616bc3ad59963ad7cead0b5f28acc6bd147c81cedf603e41065c) in the field at the bottom and click "Accept".
- Only transactions addressed to you can be accepted.
- Only "confirmed" transactions with 10 or more confirmations can be accepted.
To spend Monero you have to wait 10 confirmations for funds received in normal transaction and 60 confirmations for funds received in coinbase transaction.