Item difficulty represents the number of people who get the item correct - it is calculated by taking the number of correct responses correct divided by attempted responses. The Item Pool difficulty is found by taking the average of the item difficulties. You cannot adjust the item difficulty manually. This article will show you how to check the difficulty of a form by section.
1- Use the Scorpion drop down menu in the top left corner to navigate to the Forms page.
2- Click on the form you would like to check on the difficulty for.
3- Click on the Content tab.
4- Scroll down and select the section your would like to see the difficulty for. It will be listed next to Item Pool.