first advice, is maybe just put your image in the working directory for your R session/project, that way you dont have to deal with path's to it (until you are more confident about that).
Then you could follow the documentation:
Functions of magickGUI package may fail to recognize magick-image object
A solution is to convert a magick-image object into png.
library(magickGUI)
a <- image_read("test.jpg") %>% image_convert(format = "png")
interactive_reducenoise(a)