Issue with Character BP! Please Help! ;(

I have an issue with the “ThirdPersonCharacter” Blueprint;
I have a “ThirdPersonTemplate” Map and my custom Map, on which I design my level and so on. Since I wanted to rename the “ThirdPersonCharacter” to “GameCharacter”, I only can edit the “ThirdPersonCharacter” in the “ThirdPersonTemplate”. I mean I can open it in my custom map, but it doen’t work when I edit it…
Also I copied the “ThirdPersonCharacter” Blueprint to create an AI, but I don’t think that’s a problem…

Help would be really nice,

set your new character as the default character form game mode