See the Financial Cash Flows Examples for examples for this calculator.
CALC 1 has the Cash Flow and Cash Flows PYR calculators.
The Financial Cash Flows PYR calculator can be downloaded.
For the shift keys:
Using the "long press" gesture will display a hint about any key. (Video: Displaying a hint) You can inspect the Key Details to see the formulas and functions for any key.
Also see
Storing and Recalling Numbers.