Login condition on Button

I have a question about put a condition on a button as :
if the user is connected the button link to the bookin page
But if user is not connected it link to the sign in page

It is possible , thank you in advance

If you mean by `connected’ that the current user is Logged On, then yes, this is possible. Every user of type ´Member’ is always loggedOn. Look here: Page Not Found - Velo API Reference - Wix.com

I didn’t find how open an page with the documentation after en clickevent

To navigate to a page on button click use the wix-location .to function.