Thanks.
I've now posted in the Blue Iris forum to see why the url don't seem to work properly in triggering through a web browser. It keeps asking for the user name and password with the url I've tried and then goes to another address on my blue iris server.
I guess I'll need to get the url working first before continuing on the arduino ide coding huh.
I will be back once i can get it working through a browser as I'm keen to get this going.