Here are the steps:
1) Decide which form/s to modify. Each document(Invoice, Order,etc.) comes in 4 forms: Blank, Short, Long and Other.
2) Open Report Writer then drag the form from Original Reports to Modified Reports. Don't worry you're just creating a duplicate of the original report.
3) Choose the form, click Open then Layout
4) Go to the Toolbox change the drop-down to Customer Master Address
5) Drag Contact Person to the Report Layout
6) Go to File then Microsoft Dynamics GP. Say Yes to all changes
7) Go to Tools>Setup>System>Security then Series = Sales and Type = Modified Report
8) Give access to anybody who'll need your modified report. Should show * after assigning.
Goodluck
Duke