Can not see certain add-ons

I bought a waystones add-on and I can not see any of the waystones or anything related to the add-on. I first saw this add-on when I joined a realm and after playing on the realm for a few weeks after an update on minecraft I was no longer able to see waystones so I bought the same add-on to hopefully fix the problem and no luck. the add-on was bought on Minecraft marketplace.