1. Go to Control > Query
2. Click New > Select Payments Query
3. Expand Gift > Gift Related Information
4. Click Source Code > Click Add
5. Select your criteria (i.e Source Code Is one of ... etc)
6. Click Ok 
7. Click Next
8. Select fields for output (i.e First name, Last Name, Total Gift Amount, Source Code, etc)
9. Click Finish and wait for the report to complete