How to create our own profile url

[eluser]JasmineFlower[/eluser]
hi,

I am new to CodeIgniter,I creating a project like face book. In face book website,we can create our own profile url name.

for example my facebook profile url is: www.facebook.com/jasmine-flower

how can i create same like this in my project?

I use CodeIgniter 1.7.3 with smarty.