Tell the user to follow these steps:

1. On the header of the Knowledge Checks dashboard, you will want to open up the "Confidence Levels" section.

2. From the confidence levels section, the user will then be able to select from the low, medium, or high confidence levels for the questions they marked.

Please note that not all Knowledge Checks are reviewable. Sorting questions by confidence level will only show questions that are reviewable and that the user has marked their confidence on.