Read this if you need help getting your mongoose string
Go and head over to https://www.mongodb.com/ and then sign up.
It will ask you a few questions and then after that, create your connection and make a password and username. (It'll walk you through it)
Once you have did that, connect your application & copy the string and boom! You have your string.
(If you need help getting your bot token & getting your mongodb string, please visit the other files.)