The financial concept you're referring to is known as amortization, and the pertinent documentation in the 12c user's guide starts on page 54 of the manual (at least the one I have). Examples with keystrokes are shown in that section.
In your case, you'll need to do this in three steps:
Compute the payment amount based on the given values
Reset the periods to 0, then compute the amortization for 237 periods
Check the remaining principal balance with RCL PV
Make sure to read the special note referenced with the "*" for the first paragraph of that section. It contains important information regarding the rounding of intermediate values for amortizations done on the 12c.