How to add addtional blocks and how to change our skin

To change your skin, when you're signed in to classicube.net, click your username on the top right.

Adding additional blocks is more complicated.
If you're in singleplayer, it's not possible.

If you're in a personal realm in an MCGalaxy server (most servers are MCGalaxy), you can say /os lb create
Then follow the instructions by entering the values you want. (e.g., next step is to say /os lb My custom block, to name it)

If you are the owner of the server, you can use /gb create, to create global blocks, or /lb create, to make blocks only in the specific level you're in.

Thank U