To delete any question, click on the trash icon found in the questions panel or the question editor for the particular question.
To add more questions to the assessment, click on the + Add question button located towards the button of the question panel.
To reorder questions, click the 2 arrows next to the trash icon.
A small dialog box will open. Choose the position (Before or After) and select the specific question from the question drop-down list. This will position the question you want to move before or after the specific question you select from the drop-down.
Once you add all your questions, you are ready to move to the assessment settings.