I never heard an r sound in präst. Should it be there?
It is there, but it's very subtle so it's understandable a non-native would miss it. Unfortunately I'm not good enough at describing pronunciations to elaborate on how exactly it sounds.
where is the "a" or "en"?
Swedish doesn't need one. A lot of languages use this model.
Yup. But it's totally okay to use it. At least when speaking it is probably used a lot without anyone noticing.
why is it that sometimes it is shown that the discussion has some comments, but in reality it has none?
It is my understanding that Sweden is primarily Lutheran. Do Lutherans have priests? What are the words
for minister or clergy?