Hi farmgirlkent69, now you have this setup yu can record depositing money into this account using a bank deposit (+ New > Bank deposit).
One the bank deposit, enter the petty cash account under 'Account', select the date this was received, and scroll to 'add funds to this deposit'. On this line, select the account used to track the donation income under 'Account', enter the amount received, and change the 'Amounts are' drop-down to 'No VAT'. Get back to us below if you have any questions on this!