Creating a website with dotCommunity is designed to be simple.
When creating a website be aware that to maintain the high quality of the service, your application for a site must be approved by an administrator. This does not usually take very long.
If you are already a registered user then you do not need to re-register and can skip straight to step two.
For further information consult the helpsheets on: Registering for an Account and Applying for a Website.