extract kit addtions

looking over the instrutions for my next brew which will be a dark cheery stout and read that the cheery flavor comes from adding cheery extract to the bottling bucket . started to thing that i will be bottling a porter in the next few days and thought about adding some mexican vanilla to it ,So my question is would i just add the extract to the bucket or is there some other way that this should be done thanks in addvance

https://www.homebrewtalk.com/f39/adding-vanilla-extract-bottling-bucket-357659/
Check the Link above, you might find answers there. I have no experience personally.