Endnote disappeared form word's toolbar

I was working with endnote x5 and suddenly it disappeared from my word’s 2007 toolbar. Tried to fix it with “Help” instructions, but was unable. What must I do?  Thanks

What “help” instructions are you referring to, mabilda?   Have you seen this article in our knowledge base? It addresses the very issue that you describe.  http://kbportal.thomson.com/articleRedirect.aspx?aid=82599|