Attaching instead of debugging when opening a file with .c extension in MVS, how to cure?

Question

visual studio

1. When opening files, the debug start button does not appear, instead of it, "attach", how to set it up?
2. When creating a project in MVS, further editing is not taken into account and everything remains unchanged, even if you delete all the code and start the console, everything seems to have not been edited at all, what could be the problem?