50g

I use the convert from unit to unit, (like temperature), a lot on my
HP48, so I tried to do the same on the 50g.  I don't understand and
the book does not give a good example.

I tried to convert F to C by the following: 
32(units-temperature-F)enter
  (units-temperature-C) enter
Then I've tried several things:
1)Left arrow-ans
2)Left arrow-convert

Can someone steer me in the right direction?  So far I like the 48
better but I'll keep an open mind.
Thanks,
Ron