Setting Output Voltage for MP2491C

Hi, how do I set the output voltage for the MP2491C? The only thing in the data sheet is this table: (see below)

However, how are the resistors R1 and R2 chosen for the case below with 5V-20V output?

More importantly, how is V_ref and R1 and R2 chosen for the 3.3V output shown below:

I am looking to achieve an output voltage of 6V but cannot find anything in the datasheet to help with selecting V_ref, R1, or R2.

Hi Ronin,
Thank you for utilizing MPS Forum,

Please look out for an email from me, we will be taking care of your request outside of forum.