Automatic Indentation does not work ! Have to go to menu and select it!

[Mike H]

I am a newbie in using emacs.
Could anybody help me on this ?

When I created .c file in emacs, it recognizes that is -cc mode.
The color syntaxing and everythings seems to work.

However, the indentation does not work.

I have to manually go to the menu options to select "indent lines"...

Is there any command to activate that indentation?
Can I put that indentation command as a default ?

Thanks !