Hello @Margie20,
I see that you have a strict cancellation policy.
If the guest cancelled more than 7 days before checkin then Airbnb will refund them 50% of what you charge minus the Airbnb fee.
So you can refund them the other 50% + the Airbnb fee if you wish. Airbnb will charge you the amount that you refund.
If they cancelled within 7 days of checkin then Airbnb will not refund them anything so you can refund them the full amount.
To send money to a guest find their reservation in "your reservations" and click on "Send or request money". Then choose "Send money" and follow on from there.
Steve.