Hi Nrn, if you have active dry yeast you can substitute an equal amount. While these days active dry and instant yeast are formulated very similarly and you can generally add the active dry yeast in with the flour, just like you do with instant yeast, for this recipe I would advise adding the active dry yeast to the lukewarm water first, and letting it sit for 10 minutes before adding the remaining ingredients. Since this recipe has a fair amount of sugar, this will help the active dry yeast get off to a faster start. Otherwise, no other changes should be necessary. 

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