Can't add notes

I keep getting errors like "can't cross the bar line" and "Note does not lie within proper division of tuplet" those along with a myriad of other messages whenever I try to edit this piece of music and I'm now ready to throw the whole computer out the window.

At one point I was simply trying to change an 8th note into a quarter ... of course adding the proper rests.... etc to keep the math right.... but I can't make all of those changes at once. Of course once I make one change it will throw everything off for a moment until I can get the other parts correct. Why can't I change these simple note types?

Can I turn off the autocorrect or whatever it is for a moment?