How do I add more people to shared albums in Photos on the Mac?

[iMore Question]

I was playing with Mac Photos and added a friend to a shared album. I went back and tried to add another friend, but it doesn't seem to accept anyone else . It's like there's no 'ok' button

 

[Just_Me_D]

Hopefully, the answer in contained in the information found via the following iMore Blog link.

http://www.imore.com/how-use-photos-os-x-ultimate-guide

 

[Bob Wylie]

I agree

It doesn't seem to work

Any ideas?