When you login to Lumeer using a social login (Google, GitHub, Twitter...), your password is maintained by the particular social network. We do not store your password in such a case and we cannot change your password.
When you created your account with us, you can complete the following steps to both reset and or change your password (the procedure is the same).
Access the login page at https://get.lumeer.io/ and click at Don't remember your password? at the bottom of the form. If you are being redirected to the application, logout first (click at the user icon in the top right corner to open the user menu, then click Logout).
In the next dialog, you can request a password reset/update link via email.