Make sure none of the iWork applications are running or loading upon startup. You should be able to delete the templates provided they are not locked for one reason or another. What kind of error are you receiving? Post it here if possible.
I don't get an error message, per se. I just need step-by-step instructions on deleting unwanted templates that I accidentally saved. I'm still a neophyte.
BTW, this is the very first time I've participated in any sort of forum -- so be kind!
I currently do not have my copy of Pages installed so I can't really give you a step by step as to where they're located. (I use MS Office 2011) However, if you remember the name of the templates you saved, do a Spotlight search for them. Spotlight is the small magnifying glass which is located in the upper right hand corner of your screen on the menu bar.
Click on it and enter the name of one of the templates. It will give you the location. From there you'll be able to see the other templates which you want to delete in addition to the one you searched for. Just delete them all that you no longer need.