Hi
You can include Google custom search in your site page and then design the search layout using customized code or If your hosting provider provides you search modules to add on in your site then you can go with that.
This needs to be done from hosting end , you can copy the code and use in Muse pages.
If you are using Adobe servers to host your site , then you can use search module and place on page.
Let me know if you have additional questions.
Thanks,
Sanjit