I have a renter who pays cash. In QB desktop I could just enter the amount in an account called due to me. How can I do this on QB online?

@rxc5 

When you get paid in cash, nothing should be different other than the initial bank account that the funds are deposited into from the invoice payment or sales receipt.  Create a bank account in QBO called "Petty Cash" or "Cash On Hand".  When you receive the cash, deposit it into that account just like you would deposit a check to Undeposited Funds or your bank account.  If you end up depositing the cash into a bank account, make a bank deposit and select "Petty Cash" or "Cash On Hand" as the Category for the deposit.