Save Multiplayer Name

Hey, how can i set to my project, if the player start the game at first time he need to set her nickname and the other starting the game load the player nickname.

Use the savegame nodes and create a new savegame blueprint.
Use the Does Savegame Exist node to find out if the nickname was saved already once before.
Use Load Savegame node to load the nickname if it exists. If not then present the user with a text input
On the text input’s commit event, then use the Create Savegame node to put the text in to the savegame object, then use the Save Game nide to save the created Savegame object to a file which the Does Savegame exist node and the Load Game node can read as described in the first part of my answer.