How does CommandSign work on LiquidBounce (Minecraft Hack)?

How does CommandSign work on LiquidBounce (Minecraft Hack)?

You can write commands on the sign, or do you have to set these before. If you then place the shield, you may be able to press the shield and get (for example) OP on the server.

This is only possible if it is a full vanilla network. Strangely enough, if you are still able to use the Command Signs on other servers (for example, on non-blocked servers, or on servers that have not blocked the shield, through plugins, etc.), the Serverowner / a member with admin rights must click on the shield!