How to save TRANSACTION details, exactly for logged in user??? in Phpmyadmin

In my WEB-SITE user Registration information and Transaction details saves in one database, But After user logged in and make online payment in Website, In PhpmyAdmin Transaction details saves to New line with unknown Name, Surname etc. in database table.

How to define that Transaction belongs to logged in user.??

1- Column: After registration 2- Column: Transaction Details saved to new column