Change variables for server and clients?

Hello guys,
Replication is new to me and my problem is that I don’t know how to change a variable that changes on every client from a Event like a button press on a client. The change stays always on the client.

Variable replication works only from Server to Client. If you want to send a variable to Server you need to call RPC event “Run on Server” and then “Multicast” from Server to all Clients.