"System Information" is a separate application. To open it, choose the Launchpad icon at the bottom of the display (at the right of the Finder icon), select "Other" and then, open "System Information".
After opening the application, you will see the System Information window on the display. At the left of the app, you will see a sidebar with some options, so choose "Power". Then, you will see your battery information on the main part of the window, so look for "Charge Information" and "Health Information" and select all the info inside them. Finally, go to Edit menu (on the menu bar) > Copy, and then, paste it here