Welcome to this moderated community forum and thanks for the interesting question. If you're new to Power Platform and if you are trying to use the projects along with the copilot, its a great choice. I would certainly recommend you to watch the official documentation and understand about the Power platform first which you can go ahead and find it here.
To make use of the Copilot you can go ahead and create an environment under the US region and you are using that environment. Once you started using it, you would be able to find the prompt window which would allow you to type the prompts that you need. Apart from this, you also have an option to modify the functions, triggers, add virtual assistances in the Power platform under the various services. Please do try all the services based on the requirement.
Hope this answer finds a solution!. Please do reach out here if you have any further queries on which services you need to use for which requirement. I would be happy to help.
Chakravarthi Rangarajan Bhargavi
-Please kindly accept the answer and vote 'Yes' if you feel helpful to support the community, thanks a lot.