True imbicillic questions are the ones that never get asked...
If you do not have a menu called "StructureTools" you are probably working in the "unstructured" FrameMaker interface. You need to change the interface option in the Preferences. Choose the File > Preferences > Gobal command and select the Structured FrameMaker option from the list box at the bottom of that dialog. Then restart FrameMaker. If you create a new document, the dialog shows you a bunch of folders with structured templates of all kinds.
If it helps, I have a video on changing the interface.
Just bear in mind that the very first checkbox in the dialog 'resets' when you change interfaces. I don't know why, but the Automatic Backup on Save comes on when you toggle the interface. If you do NOT want that, and have previously disabled it, turn that one off. Just keep an eye on it the one time and on restart you are good to go.