1. Create your individual profile by using facebook connect in 'join now' or by typing manually.

2. For creating non-individual profile (organization or corporate profile, page, shop, etc), fill details along with working mail-id otherwise choose a random email id if you dont have email-id (example: But contact us after creating that profile. we will activate and assign this under your individual profile.

Go to profile edit (for that just hover on your profile photo for 3 seconds and click 'Edit' tab).

Fill your details and change password.

If you join through facebook, your username is autogenerated and redirected to your Home page where you should change password and fille necessary details by clicking 'Edit Profile'.
Just hover on your profile photo, click 'i' to know your username.