I need disable "clickjack protection for non-Setup Salesforce pages" on My Hands-On Org. When I go to Setup> Session Settings > Clickjack Protection to try to disable the parameter I recieved the message "To disable this contact salesforce.com". Any help

Hi Juan, unfortunately this is not possible anymore to open tickets from a developer edition. Are you registered as a partner or do you have a production org where you can open up a case and reference the org ID for your hands-on org there?  Here is a link which could also help you: https://salesforce.stackexchange.com/questions/44308/how-to-open-a-case-in-salesforce-support