If you haven't linked your bank account to the app, it is up to you to indicate that your tenant is up to date with their payments.
To do this, go to the "Tasks" tab, then "Payment Delays".
Then, simply choose the contract for which you want to mark the tenant as up to date and click on the three small dots at the bottom right, then select "Payment received."
You will be asked to fill in all the information regarding the payment:
The amount
The payment date
The payment method
And, if you wish, a brief description of the payment
Don't forget to click on "Save this payment."