1. Install Tampermonkey for your browser, assuming you have Chrome or Firefox:
https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo?hl=en

https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/

2. Install the user script for cytube:
https://cytu.be/js/cytube-google-drive.user.js

problems installing? try this:
>download the script
>click the tampermonkey extension on chrome
>create new script
>delete all text
>drag the file onto the script editor
>save
>go to cytube and see if the script is enabled