User may login to SurgeMail (http://webmail.yourdomain.com/surgeweb)
Click on Options > Preferences > click on the "Change Password" > fill in the new password in both fields (new password and confirm new password) and click on the Save > done.
Example
Domain : acd.com.my
Step 1: Login to SurgeMail (http://webmail.acd.com.my/surgeweb)
Step 2: Click on Options > Preferences > click "Change Password" > Fill in new password in both fields (new password and confirm new password)
Step 3: Click Save > Done