close enough.
first install tampermonkey extension by going to https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo?hl=en
second, go to extensions (puzzle icon on google chrome), and click on tampermonkey
third, click on Create a new script
fourth, in the editor, select all the code and paste it with the code written in script.txt
press ctrl+s
now whenever you open blocktanks.io it will run the script, so now u can ENJOY!