Display data on a report from SQL Database

Hi,

 

I had hired a freelancer to make some program for me. He gave me the software but not the source code. It has a desktop software which sends all the data to sql server. 

 

The below information is showing in the report. It pulls shop name, address, phone number and email address from the SQL database.

I want to add the below fields in the same. It shows everything as is and does not pull correct data from the database. 

 

There is are two tables in the database. One has customer name and number, another table has customer tax id. How can i link this form to those particular table so that it shows the right information. I am not a programmer so any help would be greatly appreciated.