When ordering a DNA test make sure to use these links so that WikiTree gets credit for the referral:
https://www.wikitree.com/wiki/Help:DNA_Tests#Ordering_a_Test
Thank you for helping WikiTree thrive!
Just a follow-on note (because someone asked me) purchasing a test kit through the WikiTree affiliate link doesn't change or limit your account with the testing company in any way.
The specific question had to do with participation in a Family Tree DNA Surname Project if the test kit isn't purchased through the Project's webpage. As I described in this post, it does require a couple of mouse clicks to join a project after you receive your new FTDNA kit number, but it's literally a 30-second operation. If you buy the test kit from the Project's webpage you'll be joined to the Project automatically; that's the only difference.