I just got into making a server and i cant figure out how to remove the [Player], looking to remove it and put [OWNER] in front. Any help would be appreciated. (kinda new to coding and stuff too)

You would have to create a group called  owner and put yourself into it, there is already an Admin group which you would already be in (having made yourself owner admin in server user config)
 for the player group you would use (in the data config)
"Hidden": true,
"HiddenIfNotPrimary": true

for the Admin (or owner)
"Hidden": false,
"HiddenIfNotPrimary": false