Im sure this is very simple..

[NotSep]

Step by step instructions:

Step 1

• Open your Steam Friends list.
  

Step 2

• Go to the status dropdown
  
  
  
  Spoiler :

  [Image: UV5trEu.png]
  
  
  
• In that dropdown click on "Change profile name..."
  

Step 3

• You should have been prompted with a new window.
  
  
  
  Spoiler :

  [Image: Jd2eDpp.png]
  
  
  
• Change the name in the circled area to something like this.
  
  
  
  Spoiler :

  [Image: esBctlh.png]
  
  
  
• Click OK.
  

And that's you.