Open the original seal drawing using the File --> Open command. License Seal files are stored by default in the C:\Program Files\Software Republic\Pro Contractor Studio\Misc Symbols\Miscellaneous\Seal folder.
Use the View --> Properties command to change the text for the name and license number on the seal. Save the seal and the next time you place it on a new drawing it will have your information on it.
Refer to the video on Texas Licensed Irrigator Seal in the Online Tutorial Videos under the Dressing up the Drawing category for more detailed instructions.