You should be able to do this by clicking the‘Forgot Password?’ link on the login screen:
Not receiving the login password?
If you don't receive your login password, it's probably because you previously signed up with GitHub or Google, and you are now trying to log in with the email address for this service(email + password). Those logins are managed by GitHub/Google and as such we have no control over their password.
We can confirm this for you, please share your email with our Support team and we will let you know.
If this is the case, you will need to click the respective login button, and if need be, reset your password with your provider. If not, we’ll advise what to do at this point.