From a web browser, navigate to https://support.symantec.com/
Once on the page, at the top right select 'Sign In/Register' and you'll be prompted to enter your Symantec Connect credentials:
Once you've successfully signed in, select 'Manage Article Subscriptions':
Scroll down to 'Channel Subscriptions' and search for the product you would like to subscribe to and the preferred channel:
Select 'Subscribe' to complete the process.