avoiding conflicts with the trial version of Endnote X8 (now expired) and the online version that I want to use

I downloaded the trial version of X8, on to my Mac, and now this is a tab on Word.  However, the online version will work better for me.  If I uninstall X8, will this avoid any conflicts with the online version?  I don’t want to install Cite While You Write until I can avoid conflicts.  There is nothing in X8 that I need to keep.

You can just swap the EndNote X8 tools with the ones for EndNote online. Please see this article:

http://endnote.com/kb/82614

You may have to Quit and re-start Word to see the name of the tab in the Ribbon change.