How to launch the TI-84 calculator on testnav.com?

Last update: 
There are four steps to open the online ti-84 calculator. Step 1 Click the following link
to open testnav.com in a new tab.Step 2 Tap the "Start" button.
 
Step 3 Tap the "Start" button.
 
Step 4 Tap the "Calculator" button.
 
Result Then you can use the TI-84 calculator online
 
You can also start Scientific Calculator or Desmos Graphing Calculator.