How do I make a share button?

I'm trying to make a share button for my game following this tutorial

scirra.com/tutorials/908/fa ... button-php

but I'm getting this error prntscr.com/3z2yyt everytime I try to use the Go to URL function.

It works fine another game wrote in html5 without construct 2 but here it just make me mad...I even tried using javascript but it is way too limited.

What should I change in the syntax?

Put the URL inside of quotes (eg "http://www.yourlink.com"), I think that will make it work

Thank you very much,you are a life-safer