Hello Jane,
Thank you for your message.
Please note that we've removed the previous thread with the same title/text in order to avoid duplication.
In order to change the Host password you can follow
this step-by-step guide.
Alternatively, you can
uninstall Host completely following
this tutorial - this will ensure to reset Host setting and remove any previously set passwords. After uninstalling, please restart your computer, re-install Host from scratch and set a new password.
Hope that helps.