YOURJIMBFF is made and run by Yusuf Richardson. If something is wrong, confusing, or you just have a question, email yusuf@yourjimbff.com and a person answers.
You can delete your account and everything in it yourself: open Settings in the app and press "Delete my account and all my data" at the bottom. It cannot be undone.
To get a copy of your data, email the address above from the email you signed up with.