Cannot find dialog box to add repository URL

I am using LMS vs 7.7.0 on a mac running os 10.7.5
I do not see the window at the bottom of the page to add this URL http://repository.ickstream.com/squeezebox/repository-macosx.xml
thoughts, suggestions? thxs
I do not see the window at the bottom of the page to add this URL http://repository.ickstream.com/squeezebox/repository-macosx.xml
thoughts, suggestions? thxs