This depends on what function, and what TI calculator.
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To find the zeros of a function using a TI-30X calculator, first, enter the function into the calculator using the appropriate mode (usually in "function" mode). Then, use the "Table" feature to generate values of the function. Look for where the function changes signs, indicating a zero. You can then estimate the zero by narrowing down the interval around the point where the sign change occurs. Note that the TI-30X does not have a built-in root-finding feature, so you might need to use a graphing calculator for more precise results.
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You can use the cables that come with the calculator to get them from friends that already have them.