Step 1
Download and install the client software, by unzipping the folder, and running the exe inside.
Step 2
On your 'all programs' list, press MV3D, and then run 'runclient' to start the software
Press 'New player', and fill in the form.
Step 3
then just press 'connect', select your desired server, enter your username and password and press connect.
And you're done!