You cannot change your Chatbot password from the mobile app.
To change it, open chatbot.app in a browser and sign in. Go to Account Settings → Change Password, enter your current password, choose a new password and confirm the change.
If you cannot remember your current password, use Forgot Password on the chatbot.app sign-in page and follow the instructions sent to your registered email address.
If you originally created your account with Google and do not yet have a Chatbot password, use Forgot Password on chatbot.app and enter the same email address used for your Google account. Follow the email instructions to create a Chatbot password. After setting it, you can sign in with either Google or your email address and password.
For an account created with Apple, continue using Apple sign-in unless email-and-password sign-in has already been set up. To change the password for your Google or Apple account itself, use that provider’s account settings.