I’ve asked a similar question and am also looking for an answer to this. It’s not about changing all the buttons, it’s about changing only one of them.

Putting the button in the supporter nav is not terribly useful. We’ve got a lot of people who will not want to “sign in” and give information. We want to get them to the donate page quickly and clearly, with a minimum number of clicks.

It would be useful if we could get a piece of code that started with

(if the button is = ‘donate’ or some other slug, then)
(here’s the code to change that button)

If you can include the code to make that button sit on the right side of the top nav instead of put with all of the others, that would be even better.