My TI-84 Plus Silver Edition's Y= has an unusual setting. What I mean is that the side figure gives me a Play, Fast Forward like settings, when I want it to be lines. Also, I can't input two functions at once.

You must have used the TRANSFRM application before. It remains in memory and takes over the graphing function from the native OS. You must unload it from memory.

1. Turn calculator ON
2. Press the [APPS] button.
3. Scroll Up (faster) or Scroll down till you see :Transfrm in the list of applications.
4. Highlight that line and press ENTER.
5. The new screen invites you to Uninstall or Continue
6. Press the number key that corresponds to the Uninstall option (1:Uninstall)
7. Return to your [Y=] editor screen to verify that the style lines have changed to the "normal" ones.