How do I add a host in icinga-web?

how do I add a host in icinga-web? Do I need to modify access.xml and rebuild the cache? Or can I have a configuration similar to icinga/nagios?

To add a host, you must define it first, e.g linux.cfg:

define host {
    use                 linux-server
    host_name           s80
    address             x.x.x.x
    check_command       check-icmp
    contact_groups      admin
}

(Do the sames for all services which you want to monitor)

Insert full path to this file into icinga.cfg:

cfg_file=/usr/local/icinga/etc/hosts/linux.cfg

Verify your configuration with:

# /usr/local/icinga/bin/icinga -v /usr/local/icinga/etc/icinga.cfg 

and restart Icinga:

# /etc/init.d/icinga reload