Welcome to the Community, @vrenaudbookkeepi.
I'd be happy to help share some insights about entering an expense.
The payment account is the business account used in getting the funds for your expense. The payment method is what you choose when compensating the seller of a good or service. Typical methods used include cash, checks, credit or debit cards and others.
Let me show you a sample of an expense transaction.
This should answer your concern for today. It's my priority to help, so please feel free to let me know if you have additional questions about your expense. Have a good one.