Thank you! The answer was a combination of moving the frame cursor past frame 0 in order to access the correct tools, and using Alt in combination with the Transform Bone tool to "force translation", and being on the correct layer. Thanks for your help!

Using Anime Studio 10 Debut I am following along Vern Zehr's very helpful Youtube video on how to create facial rigs (http://my.smithmicro.com/webinars/anime-studio/creating-suctom-facial-rigs-anime-studio/) Right around the 16:15 mark, he has the "Add Bone" tool selected, yet he is able t...