Figured it out.
OK for those of you that will need to do this:
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In Construct:
* Select the hamburger menu On the main project in Solution Explorer
* Project Properties
* Set the Web XPanel IP ID & Save
* Clean & Build Solution
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In Toolbox:
* Connect to processor
* Web Pages & Mobility Projects - Select Archived File in Project Format
* Project File - Select your ch5z file
* Project Management - Load Project As: CH5 XPanel
* Send the project
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In Browser:
* https://processor ip address/construct ch5z project name/index.html?ipId=0x03
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Notes:
* I had to enter the IP ID as hex to get mine to work
* Make sure the construct ch5z project name matches exactly what has been loaded in Toolbox
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Hope this helps others as wading through Crestron documentation is pretty grim now