Please help

How do u do it so when someone types -name Superman there name changes to what they say

I'll assume that you have basic string knowledge. Each string has a fixed length and you can extract substrings from it. Now what you need to do is extract a substring which starts right after the order(in this case, 5 characters) and ends at the string's max length. Then you have extracted the player name. The rest is easy, just change the display name for that player to the extracted substring.

that sounds harder than i thought it would be which isnt good ummm ty for ur help ill see if i can figure it out ill reply to this again tomorrow if i havent

https://www.hiveworkshop.com/forums/showthread.php?t=34686
Here is a tutorial on chat commands.
Try to search the tutorials section and use the search threads button next time.