To change your password, log in and access your Profile using either the first button on your Dashboard or the Profile tab on the navigation bar.
Once you have navigated to your profile, you can highlight the existing dots, erase them and enter a new password.
To save your changes, scroll to the bottom of the page and click Update.
Note: No matter how many characters password has, it will likely always appear as a fixed number of dots. Even if this looks way too long, your password was saved correctly.