I want to trigger a tag when a user visits a certain web page. I am following the instructions at this page to do this - Goals - Web Page Automation | Max Classic
However, when I try to add the URL in steps 6-8, the URL disappears and nothing is saved. I have to click cancel to get out of the window. Here is a screen recording of my attempt - 2018-06-28_0021
Anyone have any thoughts of what I am doing wrong?