First go to the Custom Maps page on the official Plazma Burst 2 website. If you are properly logged in, at the bottom of the page should be an area labeled "Your Maps." Below, you will see "New Map ID:" followed by your username and a dash, followed by a text box. In the text box, type the desired map ID. Do NOT use any capital letters, spaces, or symbols in the map ID other than a-z, 0-9, and _. Once you have entered the desired map ID, click the button to the right labeled "Create New Map."