To Cancel a Mister Linky Subscription, you have to Login to your Mister Linky account and go to the main page. You need to click on the "Support" link to access the customer support page. After that, Enter your name and email address, the category of your email and the priority of your email. You must enter a subject for your email. Then, compose a message stating you want to cancel your subscription to Mister Linky, you should click "Submit Ticket."