How to change Name of connected PC.

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hello, i am getting problem while changing name of connected PC, basically i am making a simple PC game where the first PC connected to network and in room is a Master PC, it must have authority to change names of next connected PCs, No server is involved, now i am using PhotonNetwork.playerName = "my name"; but it is not modifying my Prefab, its the same which is in resources folder, i want it to be editable for master PC.