Despite multiple comments about this, none of the solutions worked on my server...

Mods installed:

Pixelmon
PixelExtras
Worldedit

I honestly don't know where the Worldedit config is so that could be the problem... Worldedit shows up in my lp tree, but when I try to do //wand, I end up with the message, "You are not permitted to do that, are you in the right mode," which I don't understand at all... So I've been trying to figure it out by searching it up numerous times, but no success. And if anyone could help me, I will be really grateful...

Ok then, I guess we can leave it here?

Are you in the right mode?

It probably asks if you're in creative as WE isn't really a survival mod.

My server is automatically set to Survival... so yes, that is the problem. But I don't how to set it to creative. (I am new with servers)

Obviously, I can do /gamemode 1, but still, in creative, I can't do the command, so I am guessing the gamemode when the server was created is the problem here.

The game mode doesn’t matter.
It’s referring to the mode in its own config.

In any case nothing to do with LP.
Reach out to WE support.