Go to copilot.microsoft.com in Safari and sign in with your Microsoft account (you can use a limited version of the service without an account if you want). Then go to File > Add to Dock and click "Add" in the dialog that opens.
Go to copilot.microsoft.com in Safari and sign in with your Microsoft account (you can use a limited version of the service without an account if you want). Then go to File > Add to Dock and click "Add" in the dialog that opens.