You can change / rename an ABAP program using the following steps. It’s a very simple steps!
1. Fill in the ABAP program in the transaction code SE38. Then, select Program > Rename.
2. Place the new name!
3. Click on Rename and the ABAP program will have the new name now!
Alternatively, you can use transaction code SE80.
Select Repository Browser. Choose Program, define the ABAP program name and press Enter. From the output, right click and select Rename. The remaining steps will be the same as using transaction code SE38.