Programming Fixed Cash Amounts to buttons TK2300

I managed to get our till back online, however it’s lost its original programming but we’re sort of working. I’ve worked out how to assign £5 cash to a button but it doesn’t give change amount, can anyone tell me what I’m doing wrong.

I think it’s PGM 2

2602 subtotal 5.00 ca/tend subtotal

Any help b grateful.

Also struggling how yeah I assign a button to a dept. We originally had Bar and Food but got nothing atm. The instructions are complicated as hell!