Need enable testimonies site to use library theme:
sites > all > themes > yul > yul.info + add this line "allowed_sites[] = testimonies.library.yale.edu"
Request Library Theme deploy to testimonies site (contact ITS Massaro, Vincent <vincent.massaro@yale.edu [1]> and Pasko, Kimberly <kimberly.pasko@yale.edu [2]>)
"Yale University Library" Theme should appear in "Appearance > Settings", set it to default, and start to work from here
Create 'YUL Wordmark' block
Create 'Menu
Links
[1] mailto:vincent.massaro@yale.edu
[2] mailto:kimberly.pasko@yale.edu
[3] http://yalesites.yale.edu/book/hiding-your-theme-other-sites