Not able to start/stop xymon.sh

Forgive me if this is a stupid question and for my poor linux skills - I'm
learning. I have installed xymon on ubuntu using apt-get install xymon and
it has started a bunch of process for me as part of the install. It's
created a xymon user. When I try and stop the service using xymon.sh stop
it tells me I have to do it as the xymon user. As there is no password
assigned to the user I can't su as xymon to start and stop the script. I am
able to start and stop it using /etc/init.d/xymon start/stop but not sure
if I should be doing it this way. Should I be setting my own password on
the xymon account and using it to stop and start?

Thanks