Goodly

Please talk to staff in the server (indicated by the white star symbol before their name) about being unblacklisted.

You might like this game: https://www.minecraft.net/

ClassiCube was made entirely by volunteers, it has no funding. A rough estimate (using this) says that it would have cost $429,333 if a programmer was hired to do the same amount of work. (UnknownShadow200 has spent around 1932 days of time working on it)

First, make sure you're using Enhanced mode. Classic mode cannot display coordinates. Your coordinates should appear on the top left of the screen by default in enhanced mode. You can turn them on or off by pressing F3. If you have trouble pressing F3 on your keyboard, you can also change which key it uses in the "Other" page of the controls menu.

Looks like you can't have your own server unfortunately. There are many existing servers you can join that allow you to create and customize your own private worlds, though

You can use https://lemehost.com/hosting/180/classicubemgc

Will you post pictures?

You can't use mediafire or google drive to host classicube texture packs or skins. They don't provide direct download links.

When you use a texture pack with a taller texture file, it will automatically increase the amount of texture ids. Please read my previous comment explaining the difference between texture and block IDs.

Remember that texture IDs and Block IDs are different things. Inf ID MCGalaxy allows you to add more than 255 blocks (up to 767) per map, so even if it worked you won't notice a difference unless you try to add a block using /lb add (in which case it should create the block at ID 767 with Inf ID, or ID 254 with default) By default you'll see 256 texture IDs and MCGalaxy versions will not change that. To get more texture IDs (512 total), you can double the height of the terrain.png in the texture pack.

123DMWM builds the absolutely latest version of inf-id MCGalaxy which you can find here https://mcgala.xyz/nightlies

You need to use the port that you're using for the server when connecting. Does 25565 rather than 90 work?

What method are you using to connect? If you're hosting the server on your own machine, you will need to correct using the Direct Connect menu, like this. You don't need to edit the bottom field.

Always make sure to give as much info as you can when asking for help! What was the error? Do you have screenshots of what happens when you try to log in? Can you paste the logs from the server? Otherwise we don't have a way of knowing what went wrong and it'll take longer for you to get a solution (as you're seeing now)

Issue has been resolved: block 68 was a LevelBlock (/lb) whereas block 67 was a GlobalBlock (/gb). Using /gb to remove 68 didn't work since only /lb could target it in that level