PIC's cannot output from pins that have been set to Analog. You must look in the A/D Converter section and/or in the Comparator section of the Datasheet and set the pins Digital if you want to Output from any pin.

You can of course have dual purpose pins... use them for output, then switch them to input later in the program. Fo that you will need to think carefully about your circuit design so that your outputs and inputs don't interfere with each other.

However, there is one EXCEPTION (not all PICs have the hardware installed or able to have it connected to an external pin, so not all PICs are capable of doing this) where you can have 'psuedo-analog output (there's the clue) out of one otherwise analog configured pin... can anyone else figure it? I'll give you the answer tomorrow if nobody else has guessed it between now and then.