crontab -e and made some changes, now how do I save it?
That depends on the editor you run.
contab -e uses the editor specified in the environment variable
$EDITOR. Mostprobably it's
vipress esc to switch to the command mode, then type
:wqto write (w) and quit (q).
nanopress ctrl+x, then press y for yes and provide a filename before pressing Enter.