Hi Emmanuel
is you know after you register the payment for a customer Invoice or vendor bill, it will be marked by "in payment" green flag.
that means It's still not reconciled .. it should be marked "PAID"
so in order to get that "Paid" green flag you have to reconcile all the payments.
first of all you will have to setup your Bank by going to accounting dashboard then add a bank account.
then you will have to import the bank statement you received from your bank. You can enter it manually first then export it to get yourself a standard template for the next months
Reconciliation process is very easy .. you will reconcile each statement line with payment or more than one payment.
Good Luck!