how to make a built game interface- navigation into a link available online

Hello! I have a model and I am new to unity and I did make the app and its build and all with the first viewer camera point and its ready now how can I put it online on my website so I can give people a link and they click on it and use the app. ( arrows up down right bottom and trackpad) or touch screen.

It's very simple of what I want but I cant seem to explain so please get in touch or explain of what you understood... my exhibition is around the corner and i am freaking out now

Thanks! ayesha