If you need to specify a server that does not appear
on the list, click the Add Server button. Enter a name for this server, and the get capabilities URL
associated with this server (this information is usually provided
by the WMS server).
For instance,
http://wms.jpl.nasa.gov/wms.cgi?request=GetCapabilities
or
http://wms.jpl.nasa.gov/wms.cgi
Click OK to return
to server list, where you can select the newly added server.