I found that the merge tool in Creator relies on the merge tool in GIT. GIT relies on 3rd party applications for their merge tool. The following are valid merge tools for GIT: emerge, gvimdiff, kdiff3, meld, vimdiff, and tortoisemerge.
Here is a short tutorial for setting up the merge tool in GIT.
"http://www.davesquared.net/2009/02/setting-up-diff-and-merge-tools-for-git.html":http://www.davesquared.net/2009/02/setting-up-diff-and-merge-tools-for-git.html