You can find support documentation you can use when communicating with the customer to show him how to:
handle UAT preparation and testing
report bugs so they are easy to understand for project developers
clarify expectations from our cooperation on the project
use basic templates so they have UAT phase under control
If there is a need to clarify why QA Analyst role is on the project, check out this page: Customer Assistance You can share this information with the customer. Alternatively you can share the presentation available in QA Resources → Downloads
Note that everything here is now in draft version and more documents will be added soon.