I know that when I first got my graphing calculator, things were confusing. So for people who are still in that stage, I tried to make this guide as basic as possible. If I didn't clarify something well enough, leave a comment about it please.
Also, this was written specifically for the TI-89 Titanium calculator. Some things might be slightly different on other calculators and you might have to figure a few things out yourself.
Step 1: Screens/Menus
Step 2: Notes
Then open up TI Connect (It should come on a cd with your calculator) and open up all of the files on your calculator using the 'Device Explorer' function on Ti connect.
Then simply drag your notes into the folder you want them in on your calculator. It will take a second or two for it to transfer depending on the size, and then they should be on your calculator.
To access your notes on your calculator, go the the 'Apps' menu, find notefolio, and there should be a menu. Click 'Open', then find your document.
In class, you can also open up Notefolio and manually type out a few notes (rather slowly with the keys on a calculator though). To do this, open up Notefolio from the 'Apps' menu, and start a new document, and start typing.