I looked on the bike and did not see anything that might be a frame size. I'm thinking that since I've got it, numbers may just confuse the issue and I should learn to adjust everything and set it up so it is comfortable to me.

The shifting stuff is not going well; I am going to put the bike up on something so I can turn the pedals and see what is happening while I shift.

Then again, I remember decades ago when a long past bf taught me to ride a motorcycle, he took me and the bike 5 miles from home and told me I could either ride it home or walk home. So maybe it is just best, as I think Nike says, to 'just do it'.