Yes here are the steps
1.how to make multiplayer
Step 1.click on the character logic and from local to shared
Step 2.click on the settings and make it multiplayer
How to make username
Make a text is $username with any color and size
Make the width size 9 and make it shared
How to make text on top
Delete the text (not the blueprint)
The logic for the character is when this created create text in front of all actors
The logic for the text is
When this created
repeat every 0.167 sec
Modify x position
Click value
Click constant number to value of behavior propert
Click x position
Click the actor that created me
Click modify y position
Then click on add
The left is y position
Click the actor that created me
The one at bottom make it -0.9