The adblue filler cap is in the trunk, beyond the spare tire. this DIY vid may help.
https://www.youtube.com/watch?v=1h9hWlvg6sM
"Flaw: AdBlue Filler Cap - Nothing is more annoying than getting a low AdBlue message while on a road trip. Oh, wait, there is something more annoying. What could it be? Well, it's the fact that in order to remove the AdBlue filler cap, you must empty out your trunk, get access to the spare tire, remove the spare tire, then grab the lug wrench. Yup, we're not changing a tire but it sure as hell feels like it. You see, the lug wrench was designed as the fitting for the AdBlue filler cap. So while you're in the gas station unloading your possessions on the diesel laden ground, just keep in mind that this is simply a design flaw that can easily be corrected. Audi needs to change the AdBlue filler cap design so that I can simply twist it off by hand. It's completely unnecessary to perform acts 1 and 2 of the flat tire drama to simply loosen a cap. It's a horrible experience."
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