By joining this VMware Betas Community (by clicking on the JOIN NOW button) - it does not automatically add you to beta programs such as the vSphere Beta Program.
If you are interested in participating in the program, please go to the main BETAS page and scroll down where it says "vSphere Beta Application Form" to express your interest. If accepted, you will receive an official email from "vsphere_beta_team@vmware.com" to confirm your registration and complete your beta enrollment.