An entry in the config file begins with <share> and ends with </share>, like so:
<share>
<name>Booyah</name>
<url>c:\
[email protected]</url>
</share>
The <name> tag just gives it a name so you can identify that particular entry in XBMP; it can be anything you want.
The <url> tag tells XMBP where to find that particular share; for RELAX streaming you need to put in the following format: path@IP address, as in the example above. The "1400" somebody else listed is the port; 1400 is the default and you don't need to enter a port unless you're using something other than 1400, in which case your <url> entry would look something like this:
<url>c:\
[email protected]:1492</url>
If you using a streamer other than RELAX, like samba (smb) you need to specify it in the <url> tag as well, along with the username, password, workgroup, and computer name:
<url>smb://xbox:xbox@funderland/maisy/my pictures</url>