Questions

To do that you need to log in to your site's control panel (cPanel), the login and password are NOT the same as your Netcells User Zone (NUZ), which is for managing your site's content and your User account with Netcells.

Your available disk space shows in the info table on the left, on the Home page.
You can also view it in more detail by clicking the 'Disk Spac Usage' icon.

Instructions on accessing your site's control panel (cPanel) are on: >Namecell.net/hosting/ (type your Domain name in the box).