I just Installed Metatrader 5, See Nothing! - page 2

[Tobias Johannes Zimmer]

Have you tried using your account credentials from webterminal to log into meta trader?

[Daniel Ololtele]

How to know my account is real terminal is working 

[Sergey Golubev]

Daniel Ololtele #:
How to know my account is real terminal is working 

You can contact with your broker about demo or real/live account.
As to "how to know that it is working" - read this part of the manual (incl the menu on the right side):
https://www.metatrader5.com/en/terminal/help/startworking