There are two ways to change your password.
In case you remember your existing one and want to change it, then log in to Skilling and click on the burger menu at the top left corner of the screen.
Click Settings and then Profile.
You will see the 'Change Password' button where you will be allowed to change it with a new one.
In case you have completely forgotten your password, you can click Log in through the Skilling's website and then 'Forgot Password'
An email will be sent to you, so you can change your password.