On mobile: click on the menu in the upper left corner. Click on "Log in" and fill in the e-mail address associated with your Club CHANGE account, as well as your password and click on log in.
On desktop: click on the small icon that represents a person in the upper right corner of the menu bar. Enter the email address associated with your Club CHANGE account, as well as your password and click login.
In case you have forgotten your password, you can reset it by clicking on the "Forgot your password" link.