Without knowing anything about the "website", there is no good answer. You're probably best served by contacting the Aircrack-ng project and getting their advice.
It's possible that you might need to consider running in a VMWare instance in the server and installing Aircrack-ng there. You'll need to clearly describe the site environment and the intended usage cases. Installation and ongoing access will at least partially be dictated by usage.
If you are trying to get around network security you may not get much help on this site. Most of us are ethical and won't provide hacking instructions.
Is this a Wi-Fi related issue? What website did you want to crack a WPA? Is this your own created/other one? Is this an experiment? Without more proper information and authenticated source, not possible to provide a fruitful reply.
Your intended usage seems almost certain to require involvement of the Aircrack-ng project developers. You'll probably need to present a business case in order to get ethical help.
There are numerous forums related to pen-testing where background and technical info and help might be gathered. You might join the LinkedIn Pentesting group to see if it's been done by others. A group or forum such as that one is more appropriate for your question than here.
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