If you need to fix Pitch layout removing 2 fields:

1. Click the Setup gear (upper right) and select Setup

2. Click the Object Manager tab (not the down-arrow) and select the object you need to fix from the list in the central panel

3. Click Page Layouts on the left-hand vertical menu

4. Click on Pitch Layout that appears in the central panel

5. Execute whichever of Steps 68-70 are needed to remove Created By and Last Modified By from the layout

6. Click Save in the upper left-hand corner of the central panel as shown in the screencap after Step 71 in the lab instruction steps

7. Re-grade by using the App Launcher to open the Grader App and follow instructions to run the scoring routine again and then be sure to reload the page to see the updated error list & grade certificate