The first thing you need to do is click the Register button above. 

You will be able to create a username.  If possible, I would encourage you to use your YouTube username or something similar (you're limited to 15 characters).

Check the box to indicate you are not a robot, then complete the picture challenge.

Click the boxes to agree to the terms and to receive a confirmation email, then click Register.

You will receive an email with a link that allows you to set up your password, usually within a couple of minutes.  If you don't see it, check your Spam or Junk mail folder.

After clicking on the link, enter your desired password in both fields and click Reset Password.

You will then have access to the SeriousKeto Community Forums.  A good place to start is the Site News and Announcements forum.  That is where all important information will be kept, including guides on using the forums (as I write them).

Your first post after looking around a bit should be your introduction in the Introduce Yourself forum.  I created a standard template you can follow.