This is how you add a folder to the path environment variable in Windows 11.

Step 1 — Open the "Advanced System Settings" window:

1. Press Windows+Pause/Break to open the System window.
2. Click on the Advanced system settings link.

OR

1. Press Windows+R to open the Run dialog.
2. Type sysdm.cpl and hit Enter to open System Properties window.
3. Click on the Advanced tab.

OR

1. Press Windows+R to open the Run dialog.
2. Type SystemPropertiesAdvanced and hit Enter to open System Properties window,
   directly in the Advanced tab.

Step 2 — Open the "Environment Variables" window:

• Click on the Environment Variables... button.

Step 3 — Edit the "Path":

• Select the Path row.
• Click on the Edit button.

Step 4 — Add the "New Path":

• Click on the New button.
• Type / Browse to (click on the Browse... button)
  the folder path you want to add, e.g. "C:\Program Files\Folder To Add".
• Click on the OK button.

More info at: 3 Ways to Set & Edit Environment Variables on Windows 11