The easiest way is to use a zero dollar expense. Line one: list the expense account and amount
Line two: list the owner equity investment account and the same amount as a negative, save
No owner investment is never a negative number.
If you want to use an owner payment account, a cash type bank account you create in the chart of accounts, then:
1. make a deposit in the account and use owner equity investment as the source account for the deposit
2. pay for the expense from the owner payment account