You must have an original copy of Elasto Mania to install Belma. You may order the game from the Elasto Mania homepage. You may play the game on- or offline, but of course you would like to have an internet connection for the full potential of the game.
You can always get the newest Belma version from Zworqy's Elasto Mania site.
To extract the .zip file you require software such as winzip. The installation is rather simple, you extract all the files in the .zip into your Elasto Mania folder.
A backup copy of Elasto Mania folder doesn't hurt, in case something goes wrong.
Make sure your Elma.Res file has been updated to version 1.2, then run Resedit.exe, click "Import pack" and "OK" to import the new font(s) into the Elma.res file.
To connect to the server you must open the belmaServerConf.exe file and insert information such as your nick and the server IP address. The default IP-address might be wrong, you may always find the correct IP from this page or #ballelma channel on IRCNet.
Leave the password field empty for now, a password will be required in the next version however. The TCP and UDP ports are correct by default. A correct configuration can be seen on the picture.
If you are connecting to Belma through a router you will need to make sure that your firewall doesn't block incoming messages for belma.exe. (This will most likely not be necessary in Elma Online.)
Make sure that NAT is off, or enable port forwarding for the ports in belmaServerConf.exe (4460, 4461, 4462), otherwise you will not be able to see other players. Other players are able to see you in any case. If all this seems too hard for you, portforward.com offers a rather simple step-by-step process to help you enable port forwarding.