Hi
1. replace the logo from your assets/images/logo.png
and assets/images/logo-alt.png
to change the logo
2. Please provide us your URL and cPanel login info to check what happened, also send your Login credential in a private reply
3. Delete db entries from the users table
4. delete db entries from the posts table
5. yes, it’s right way
6. You need to get some customization to have real stats.
7. Please check your smtp credential from .env file
Best Regards