1. Click on "Settings."

2. Click on "Custom Fields".

3. Click on "Add Field".

4. Next, click on "Signature".

5. After that, choose your signature file.

6. Click "Next" to proceed.

7. Enter a name in the "Field Name" section.

8. Use the drop-down menu to select a "Group."

9. Another drop-down menu will appear for object selection.

10. Click on "Additional Preferences" for further customization.

11. If you require a unique key, click to customize it.

12. Add description of the field.

13. To wrap up, click on "Save".
