make the page that my client can pin manually on my website

i want to make the page that my client can pin manually on my website.
Currently, i use Velo framework from wix the basic language is javascript.
I have been made a code that the client send their location by a button element that automatically redirect pin on google maps element. But they cannot pin manually the location for the precision address.

I hope you guys can help me to give tutorial to make it.Thanks guys