personalise the link of my project in mvc

Hi Sir,

I am in the middle phase in dotnet MVC 4


for a learning project, I created a web application mvc 4 containing an User profile.


I want to know how to customize the Routing (if that is the term to use):


For example: When a user registers or logs, it has the following link into their browser: http: // localhost / Profile / index
I would rather this: http://localhost/Profile/Username
Where Username is the name of the current user (the one that has just authetifier).
Much like facebook. Example: https://www.facebook.com/Ramses 

I know this is in the RouteConfig.cs (Global.asax) file!
I want to know how.
Is there also something to add you to my controller?

Thanks.

  just you can do in routing.config of MVC sir