How to use ?sub_confirmation=1 to get a popup youtube subscribe button. As a youtuber myself, I like these. When I visit someone I typically subscribe to them unless I forget. This is a helpful reminder to new viewers to subscribe. Instructions 1. Get the url to your youtube channel for example: My channel is this https://www.youtube.com/c/TranquilGeo 2. At the end of your url type ?sub_confirmation=1 So the whole thing would look like this https://www.youtube.com/c/TranquilGeo?sub_confirmation=1 3. Optional url shortening Go to Google url shortener to shorten your url The longer url above now looks like this: https://goo.gl/E1na6P