How do I make a script into player using a gui? [closed]

Hey, so I am a HUGE FE2 Fan. So there's a "Map Test" for this game. You can test community maps. I'm also not an exploiter. So, I can submit using a map and run scripts from the game into there. If you're going to reply with the answer, just use normal code. I've been trying to make a script executor gui into it and when the script is created, it goes into my player. Don't use localplayer because it's only for me lol.

EDIT: I just wanna exucute scripts from a gui and make it a script into my player, I don't know how to make a script editor gui or something

PS: I just want to troll in multiplayer servers lol