Adding Nodes to Cluster

Hi, I installed percona XtraDB.
It works properly. I followed these guides:
The first node is configured correctly.
Now I just can not figure out how to add new nodes? The guide is not clear for whos not skilled.

This is my /my.cnf
wsrep_provider=/usr/lib/ wsrep_cluster_name=pxc-cluster wsrep_cluster_address=gcomm://,, wsrep_node_name=pxc1 wsrep_node_address= wsrep_sst_method=xtrabackup-v2 wsrep_sst_auth=sstuser:passw0rd pxc_strict_mode=ENFORCING binlog_format=ROW default_storage_engine=InnoDB innodb_autoinc_lock_mode=2 Where i have to add this:
wsrep_node_name=pxc2 wsrep_node_address= wsrep_node_name=pxc3 wsrep_node_address= Thank you for help

If you bootstrapped your first node properly, meaning the Galera provided is up and node status is Primary, all you need to do is to just start the other nodes. If the configuration and firewall rules are OK, new nodes should join the first one via SST.
Anything not clear in ?