If you're logged into a DMACC computer, just press Crtl, Alt, and Delete on the keyboard, then choose Change a password. Enter your current password, then the new password you would like to set.
If you're offsite, log into myDMACC. If this is your first time logging in to myDMACC, you will be prompted to set up security questions and change your password automatically. Security questions allow you to reset your password if you ever lost it.
If this is not your first time logging in, just select the Reset Password link in the upper right corner of the screen after login.