How to Set a Custom Username for Google+ Profile?

Screenshot Google+ One of Google+ lack when compared to Facebook is no facility to change the username. In Facebook, we can easily access http://www.facebook.com/username to create our custom URL profile page to get prettier than default one.

But in Google+ its quite difficult to do that. So, until now, my Google+ address still use its own default URL like this:

» https://plus.google.com/106629607806000497486/

How do you see that? Quite ugly and difficult to remember right? I just hope this lack will shortly fixed by Google because I can't imagine how can I share my Google+ with that long numbers address.