When is the best time to add herbs or oil when making homeade soap?

I'm using the traditional recipe homeade lye and oil that requires a saponification reaction additives do not want to interfere. Thanks, yes, I can see that the Govt is doing everything but doesn't help me with my problem!

Always add herbs in the light of med Trace – but before the fragrance (if adding the fragrance of any additional) but before pouring into pan. Their herbs and stayed either be distributed equitably.

How to make Lye Soap : How to Mix Soap Making Additives to Make Homemade Lye Soap