Okay, this is the video on how to adjust the contrast on your screen to make it brighter or darker. There are 10 settings, ranging from 1 to 9, with each setting in increments of 4. So, that's a total of 40 different settings. To adjust the contrast, you need to press the 2nd key and either the up or down arrow. Each time you want to adjust it, you need to hit the key combination. To make the screen darker, press the 2nd key followed by the down arrow multiple times. As you do this, you will notice the screen slowly disappearing. To make the screen brighter, press the 2nd key followed by the up arrow multiple times. As you scroll up, you will see the setting in the upper right corner indicating the current value. Personally, I prefer to have the setting around 5:00 or early 6:00. Once you have set the desired contrast level, you are done! This is how you adjust the contrast on your TI calculator to make your screen brighter or darker.