XF 1.4 Some doubts after import from Mybb

Hi, I have some doubts:

1. After importing from Mybb, I can delete the original Uploads directory (Mybb) from server? Xenforo move all uploads images to xenforo directory?

2. I can rename the xenforo admin.php file with no problems?

3. I can protect with password only the file admin.php and not the entire directory?