Hi Caran - he needs to left-click the "4 Windows" style icon at the far left of the taskbar at the bottom of the screen.
From there, click "Settings" then in the large window that opens, type "Control Panel" in the box labelled "Find a setting" at the top right.
Options will open on the left as he types, the Control Panel should be the 1st option available.
The other option is (after clicking the Windows button in step 1 above) to click "File Explorer" & navigate through to Control Panel from there.
HTH