You can easily adjust your default contact information by clicking 'User Setup' in the lower right hand corner of the application window.
Once the 'User Setup' window is open you can update your personal contact information under the 'General' tab.
* Please note any new projects you create will use the updated information for your "Salesman" contact information. Projects created prior to this change will retain their existing information and will not be affected. If you wish to update an older project with the new information you will need to delete the salesperson from the project and re-add the salesperson.