email them the link to your nagios site, spell it out for them, why should that be hard to figure out?
I've clearly elaborated in the above post's. Read the docs again. It sounds like you have no clue what a host is, what a hostgroup is, what a contact is, what a contactgroup is.
You have hosts A and B.
You have contacts 1 and 2.
If A or B breaks down, how do I tell cotact 1 or 2?
Define hosts A and B in the hosts.cfg file.
Define a hostgroup called servers in the hostgroup.cfg
Define a hostgroup called routers in the hostgroup.cfg
Define Contact 1 and 2 in the contacts .cfg file.
Define a contactgroup called softwaretechs in the contactgroups.cfg
Define a contactgroup called hardwaretechs in the contactgroup.cfg
Place contact 1 in the contactgroup software techs
Place contact 2 in the hardwaretechs.
Place the contactgroup software techs in the hostgroup.cfg file under the definition for servers.
Place the contactgroup hardwaretechs in the hostgroup.cfg under the definition of routers.
Think of it like this. Do you want to have to add 100 contacts in the hostgroup.cfg as members or would it be easier to add 1 member, which is just a contactgroup?