can find place to put in product key for office mac

i have office mac on imac and want to put it on my mac pro and cannot find where i do it . the order no. and my email address does not work on office for mac 2011 website and it is so difficult to get support.
Has anyone else had this problem

The product key is entered after installation. See here for more info.

re product key for office mac

thank you for the reply

Take it from your question you purchased the download version. Did you burn it to a CD after the install? If not you may have to go to the MS web site and search for a downloadable copy.