Yes, you need to edit the file /etc/snmp/snmpd.conf to change the community name.
If you're familiar with vi, the command you're looking for is simply vi /etc/snmp/snmpd.conf (or just vi snmpd.conf if you're already in the /etc/snmp directory).
Once you've made the necessary changes, you need to tell the snmpd daemon to re-read the configuration file. Restarting it will do the trick, and in SuSE I believe that can be done with something like /etc/init.d/snmpd restart or possibly /etc/init.d/snmpd stop followed by /etc/init.d/snmpd start.
You may have to prefix some or all of the above commands with sudo to obtain the necessary privileges.