Windows 10 user.

I am working on a final project for my class and I have managed to edit most of it. I decided to save it before going any further just in case something went wrong, and when I went into both the save project tab and the export file tab the next tab that came up was grayed out. I am not sure what I should do at this point, as I cannot save, but I don’t want to get too far ahead of myself and add in sounds just in case it is all a futile effort because it cannot save. Can anyone help me?