Enter the beginning part of your e-mail address and the password provided by your system administrator. If the password doesn’t work then you will need to have someone with admin rights for your domain(yourname.com) to reset it for you.

Once they login, they should just click Settings in the top corner and then Accounts.

Then click

Google Account settings
Change your password and security options, and access other Google services.

This will take you to your Google password page.