Click on the profile icon on the extreme left hand bottom. You get a menu with My Profile option in it. Click on the option

Under the My Profile section, you get the option Change Password. Click on it

In Change Password section, you get the fields    - Old Password : Enter your old password here    - New Password : Enter the new password you wish to have with the account   - Confirm Password : Re-enter your new password to confirm with the system. This field cross            checks with New Password field and confirms if its correct

Once done with the changes, click the Update option to complete