Have you tried the instructions given in the knowledge base article “EndNote Mac: Tools disappeared from Word” available at http://endnote.com/kb/123349
if you have and the issue has not been resolved, suggest you bypass this user forum and contact tech support:
Technical support
For help using EndNote
Monday – Friday, 9 a.m. – 8 p.m. Eastern (GMT -5)
+1-800-336-4474, press 4