I was tasked with practicing how to set up back testing, so I created a video with all the steps over three charts. I selected a pair, then hovered my mouse pointer over the pair until the "eyeball" appeared and clicked that to make the chart "disappear". I then clicked the the replay button to enter the back test mode. the final step is to bring my chart back by repeating step 1 ( hover mouse pointer over the selected pair and then click the eyeball to unhide the chart).