Did not work when the language was Nederlands, changed it into English (like your example) and the button appeared.
Problem solved, however may a bugfix ?
Van: alanrichey42 email@example.com
Verzonden: dinsdag 11 februari 2014 7:57
Aan: Steven Lambeck
<https://community.sling.com/index.jspa> Slingbox Answers Forum
Change name of slingbox 500 - Edit button does not appear