To type a power (superscript) in BB you can just use the caret symbol (looks like ^ and is above the 6 on a standard keyboard). For example x3 would be written as x^3. But if you prefer prettier formatting, BB has subscript and superscript buttons in the message toolbar. For example type the base, click the x2 button, type the exponent, and click the x2 button again to leave the exponent area. The subscript button x2 is handy for typing logarithms such as LOG2x. Useful keys!