Are you using the Desktop program that has the menu items going across to top? Just go up to File-New Tax Return. You don’t need to download the software again. The Desktop installed program can do unlimited returns and efile 5. Can you explain more of what you are trying to do and how? Are you on Windows or Mac?
Oh, could it be this? If you do another return for someone else like your child and their name is the same or similar to yours then it might overwrite your return. You have to save each return with different names so you can tell them apart. Like if your name is John and your son is also named John it will save them with the same name so the second one will overwrite the first return. Go to File-SaveAs and give it a unique name.
