Add additional filter

Dear All

Could somebody please advise what is the quickest way to add an additional filter to a report.

I have created a report based on Customer and Customer Ledger Entry tables to list all open sales transactions. I have a filter on Posted Date so that I can see all the open transactions based on posted date from the customer ledger entry table. I now want to add an additional filter based on a field from the customer table called Account Status.

I am not sure where to add this and how.

I would appreciate anybody's help on this.

Many thanks