No prefix is a cool feature that Custom Commands provides. To use this feature follow the bellow steps.

After enabling this feature bot's default/main commands still needs prefix to run but the commands made after will not require any prefix. Lets follow the steps.

Login > Select specific server > Click on settings > Check No prefix and update settings

Thats it. Now you dont need any prfix just type the command name and it will run

You can also do it using commands in your server. 

Example : **noprefix toggle

It will enable no-prefix, if its not enabled and disable if its enabled