field action is configured to create a link to the customer's web site which will display the current work order

(murl = "first part of url" + input.ticket_number)  This produces a string which is the url to the desired web page.

Next, I need a button or a clickable link to access that web page in either a new window, new tab, or popup window.

I've tried to create the code for a button, but I just can't seem to make it work.  The button does show, but clicking on it doesn't work

coming soon:

Once I understand how to do this, I'm sure that there will be no problem creating a link to the fedex tracking of the parts ordered. At that point, I need to somehow pull the estimated delivery from fedex into a field. (I'm not asking too much, am I?)