I believe that there is a way to have pre-made credits, but I don't know how to. I am using Harlowe. I saw a question on this website asking how to edit the credits and customise them to make them you're own, but this was in Sugarcube so I don't know if it can be done in Harlowe.
Also, if it can, could you tell me how to edit them as well please?
Also, if it can, could you tell me how to edit them as well please?