How to bring the word press back?

Use cPanel to upload wp-admin folder. Make sure it is from the version of WordPress currently installed which you can check by browsing to //yoursite.com/readme.html

Due to the variations based on which host is used, you need to ask your host about using any tools they provide.

As for getting the folder, download the wp version and extract it – in it will be wordpress folder and in that the wp-admin folder (and the files)

If you have to upload a folder with files inside, it’s easier to use FTP software like

https://filezilla-project.org/download.php?type=client

Here is the tutor

http://www.youtube.com/watch?v=VLkH8dcR0Kc

If you want to use cPanel File Manager, then first zip that folder, upload it, then unzip it, delete the uploaded zip file, all in the File Manager.