If you need to fix the data type for any field in any object:

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 Fields & Relationships on the left-hand vertical menu

4. Click the name of the field you need to fix

5. Click the Edit button (upper middle)

6. Click the Change Field Type button (upper middle)

7. Follow the relevant steps from the lab instructions to set the correct Data Type and other field settings you're asked about and then click Save

8. 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