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This depends on what function, and what TI calculator.
The sign change key on the TI-83 Plus calculator is located on the bottom row of keys to the left of the ENTER key. It is a white key with black printing that looks like this: (-) You must use this key instead of the blue subtraction key when you need to indicate a negative number; otherwise, the calculator will tell you it doesn't understand what you mean ("syntax error").
The SE edition
You can use the cables that come with the calculator to get them from friends that already have them.
I actually need a complete tutorial for the TI-83. I lost mislaid the guide that accompanied the calculator. Any ideas on some free tutorials?