Different passwords to access my hotmail a/c from my PC and my Galaxy Fit. How do I reset it?

My son suggested I gave a different password to access my hotmail a/c from my Galaxy Fit than the password I use to access my hotmail a/c from my PC.

When I try to install an App I appear to have forgotten my password for my Galaxy Fit. How do I reset the password on my Galaxy Fit, please?

Question about Outlook Express