Send Commands

Try type /op (minecraft name) in console and then you should be able to type commands in your Minecraft game.

you got to only write op when you're in the console. ingame you need the /

is there any error message you get when you try sending a command?

At Aternos it doesn't matter if you add the '/' in the console or not.

even in the console window?

I use / in the console all the time.

Quote from UglyChester

Can i make a commands in my server like /skin set??
if yes how??

You can change you skin on the official Minecraft Site:
https://minecraft.net/profile

Otherwise, you can change it ingame via /disguise
Needs: Lib's Disguises

depending on the server version you use (vanilla, bukkit, spigot,...) there are several commands you can use. Just type /help and they pop up in the chat.