You just use the space bar on your keyboard to add extra spaces in front of the element. Give it another try and if you still don’t pass then paste your updated HTML in here so we can see what you did.
To display your code in here you need to wrap it in triple back ticks. On a line by itself type three back ticks. Then on the first line below the three back ticks paste in your code. Then below your code on a new line type three more back ticks. The back tick on my keyboard is in the upper left just above the Tab key and below the Esc key.