Use FTP.  I think I gave you the login?

Server FTP: 

ftp.dfbgaming.com 
dfbcod4 
dfbcod4009 

You can use FileZilla for this: http://wiki.filezilla-project.org/FileZilla_Client_Tutorial_(en) .

Go into dfb-server1 and then into usermaps.  Put your map folder in usermaps (you should see a bunch of maps already in here).

Then go into dfb-server1/Mods/k3_reloaded and download maprotation.cfg.  You may want to keep a backup. Open this file up in a text editor.  Postie wanted DM so that's what the game type is.  Look for a line that has something like:

set sv_mapRotation &quot;gametype dm map mp_area52......

Go to the end of that line and add  ' gametype dm map mp_backlot' for your new map (and keep the quote &quot; at the end)- just try to see how that line is formatted and keep it that way.  Save the file and upload it to the same location you downloaded it from (you will be overwriting a file).

Now you can use UGCC to restart the server.

You can use RCON to select a map:

http://www.dfbhelp.com/cod4/php_rcon/login.php 
dfbcod4 
dfbcod4009 

(There's also an RCON tool within the start and stop control page)....