If your students are using iPads, you will need to make sure that JavaScript is turned on and cookies are allowed on each device. 

To verify that JavaScript is turned on: 

1. From the iPad home screen tap on the "Settings" button. 
2. Scroll down, and select “Safari.”  
3. Tap the option for "Advanced" at the bottom. 
4. Use the slider bar to make sure that Javascript is turned "On." 

To verify that cookies are allowed: 

1. From the iPad home screen tap on the "Settings" button. 
2. Scroll down, and select “Safari.” 
3. Scroll down to where it says “Block All Cookies."
4. Make sure this is turned off. If you are using iOS 11, toggle the slider off. If you are using iOS 8-10, choose “Always Allow." 

If you are using a version of iOS before iOS 8, you may need to select "Never.” 

To clear website and history data:

1. From the iPad home screen tap on the "Settings" button. 
2. Scroll down, and select “Safari.” 
3. Scroll and select, “Clear History and Website Data” at the bottom.