To substitute instant yeast (or rapid rise yeast) use about 25% less. This recipe calls for 1 Tablespoon of Dry Active Yeast. 1 Tablespoon weighs .5 ounces, so use 0.125 ounces of instant yeast. A kitchen scale is an excellent tool to measure this. You will also not need to prove instant yeast. Just mix it in with the water and continue with recipe.