When using Snowflake Cake Flour, adding yeast is generally not required as this type of flour is typically used for cakes and pastries that rely on baking powder or baking soda for leavening. However, if you're aiming to make something like a bread or a recipe that calls for yeast, you’ll want to incorporate it accordingly. If you do need yeast, I found Instant Yeast options like the Instant Yeast Stick (5EA for R19.99) or the Instant Yeast 10G for R4.99, which can be perfect for your baking needs. Happy baking!