Then click "SERVICES" as below screen:
And next page, you will click on "Active" button as below screen (If you get more then one services, just pick the one you want to change the password) :
Next page you will scroll down then click "Email Accounts" under Quick Shortcuts
your browser will open another page to cPanel to let you change your email setting
In this case, we only change a password, let's pick an email to click "Password" and enter Password you want to change two times like below screen (Your Password need to include Letters[Lowercase and Uppercase], Numbers or symbols)
Congratulations! You just success to change your password!