How to run copilot ?

These below two links might help as well. 

https://learn.microsoft.com/en-us/power-bi/create-reports/copilot-enable-power-bi 

and 

https://learn.microsoft.com/en-us/power-bi/create-reports/copilot-introduction 

"

• Your administrator needs to enable Copilot in Microsoft Fabric.
• Your organization needs a paid Fabric capacity (F2 or higher) or Power BI Premium capacity (P1 or higher). A Power BI Pro or Premium Per User (PPU) license alone isn't sufficient—Copilot requires organizational capacity.

"

Copilot is simply not available for trial accounts.