I need help with my networking homework (NMS Zabbix)

Hi everyone. Sorry if I wrote a sintax mistake, I'm not a English spekear, I'm learning to. I'll do it my best.

I need some help with my homework.

I do a network with virtual machines on VirtuaBox and nowI need to monitor it with Zabbix.

This network consists in a NMS host connected to a router, and that router is connected with other two routers. Finally, at the last router is connected to a HTTP server. All of it (Zabbix server, routers and HTTP server) is on VirtualBox. For all I use the system operative Linux for each VM. So it's a network that in a point is a NMS (Zabix server), in the opossitive point is a HTTP server and in the middle there's three routers. The routers use OSPF protocol.

I don't know how I add a host that is a Linux's virtual machine on GUI's ZabbiX (frontend's browser). I mean, how to create the host and its setting and then add it to monitor if the hosts are all linux systems.

Someone could help me with that please.

Thanks