If you're signed in to a DMACC computer, just press Crtl +Alt + 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, sign in to myDMACC. If this is your first time signing 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 forget it.
If this is not your first time signing in, just select the Reset Password link in the upper right corner of the screen after signing in.