How do I activate the free Genymotion Desktop personal edition?

You need to create and validate your account, then click Request Trial in the top banner and submit the form. If you mean Genymotion Desktop free edition, install Desktop, sign in, and choose Personal Use.

For Genymotion SaaS free trial, choose Individual for personal use or Company for business use, then wait for validation. Individual requests take up to 5 business days and include 60 free minutes, while company requests take up to 2 business days and include 1000 free minutes. See I have just created a Genymotion Cloud SaaS account. How do I activate my free trial? and Is Genymotion free?

Are you trying to activate the free trial for Desktop or for Cloud SaaS?