What is the difference between mean and means?

[yewhoong]

I managed to explain a friend who asked me what is the difference between want and wants. But failed to explain the difference between mean and means.

Could anyone please enlighten me?

Thank you.

 

[Barb_D]

Do you understand how to change a verb for person and number?
I run
You run
He runs -- This one, third person singular, takes an S.
We run
You all run
They run

It's the same with "want, which you said you explained. It's the same with "mean."