I need help with the "name changeing" trigger and loading screen backgrounds

[InfernalKnight]

the title says it all. i have been making a map and most maps i've played have a name changing command "-name". i cant figure out how to make that. my other problem is i can't figure out how to get a picture on the loading screen. i know where to go for that, and how to make custom backgrounds but i can't figure out how to get another picture on it. please help me

 

[wurlaz]

Event: Player text message with -name as a substring.
Action: Set player name to (substring(Entered chat string 6, (Length of Entered Chat string))

 

[ronojales]

here is a tutorial for a custom loading screen.Custom Loading Screen Tutorial
i used that to make a custom loading screen, if that is what you are asking about adding a picture to your loading screen.