Hi

If you want a specific user to run a crontab (root, myself, yourself, etc) then the easy way is to log into that users account and create the crontab entry:
"crontab -e"
This gives you YOUR OWN (or that users) crontab file to edit, using say "vi", or "gvim, whatever is the default editor.

Save and exit the changes with:
":wq" from inside the text editor.

Use "crontab -l" to view the YOUR OWN (or that users) crontab contents - without the risk of editing it.

Bye
GrahamB