Zitacuaro or Morelia and senior discounts

I am trying to make a bus reservation and use the senior discount that a Inapam card authorizes. The web sites for two bus companies I looked at did not seem to allow getting the discount. Is it necessary to go in person to get the senior discount?

Separately I am looking for suggestions for a guide from either Morelia or Zitacuaro for a butterfly trip mid January.

I do not want a guide from Zihua. Gracias

Hola
Why not try a local tour guy? We have used Ulises many times. He is fluent in English and always gave us a good deal
. He has an eight passenger van or a small car , depending on how many there are of you. His number is 7555593023.