In your planning tab Figured outlines all of your accounts from your Xero chart of accounts.
For your budgets and forecasts you need to enter your $ values against these accounts as either positives or negatives, depending on the account type and if you're wanting to reflect an increase or decrease in bank account balance.
Non-operating: Positive, money coming in. Negative, money going out
Expenses: Positive, money going out. Negative, money coming in
Income: Positive, money coming in. Negative, money going out
Non operating movements and movements in equity accounts can reflect both money going into and out of your bank account, ensure you enter these accurately.
A positive amount represents money coming in and a negative amount represents money going out.
For expenses you enter outgoing costs as a positive, and a negative would be a credit note or refund. For income you enter this as a positive, and a negative would be a credit note or refund.