You owe, or you are owed
A debt is either payable (you owe someone: a bank loan, supplier credit, an unpaid bill) or receivable (someone owes you: a customer invoice, money you lent). Open Debts and choose Add debt.
When the money moves
If the loan actually paid money into one of your accounts, or out of it, turn on the switch and pick the account. A bank loan then lands in the account as a loan received; a loan you give leaves it, and needs the money to be available.
Leave it off for things like an unpaid supplier bill, where no money has moved yet.
Instalment plans
Turn on Paid back in instalments, choose how many (2 to 120), weekly or monthly, and the first payment day. The amount is split into equal payments; the last one takes any rounding.
Every payment counts toward the earliest unpaid instalment, so the Debts page always shows the next amount and date, and how many are paid.
Recording payments
Use Pay (or Collect, for money owed to you) on the debt. A payment moves real money out of, or into, the account you choose. Part payments are fine. When nothing is left, the debt is settled.