To create a set level command, find (or create) the GameName/Resources/GameName/ChatCommand folder in the project tab and right click. Choose Create > AnyRPG > Chat Commands > Set Level Command.
Properties
Name
Description
Fixed Level
If true, the player level will always be set to the level specified in the Level Number field.
Level Number
If Fixed Level is set to true, this is the level the player will be set to.