Yes, you can! Follow the given steps to edit the generated Testpaper:
Login to your Teacher Account
Click on "Testpapers" tab on the homepage
Once the Testpaper is generated and saved as a draft, the questions can be deleted or replaced
Select any Testpaper and Click on "Resume (draft)"
Select "Delete" or "Replace" as per your requirement.
In the case of a Normal Testpaper, you can simply save them as a PDF or copy the questions on the Testpaper and use word processors to edit them to your liking.
Additionally, you can also add your school name, logo, and other information as well as change the questions.