How do I change font and font size of text based on an #import[ed] template from 'Universe'?

You need to write it like this.

#import "@preview/letter-pro:2.1.0": letter-simple

#show: letter-simple.with(
  sender: (name: "Charles", address: "123 Barker Street"),
  font: "Charter"
)

letter-simple is a function with argument font to which you can pass the fontnames as a string or an array of strings.

Don’t hesitate to take a look at the Typst Tutorial on making a template.

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