Hi Jimmy,
If the config you have saved is actually the XML formatted config and not a "plain-text" script-ready config, then simply transferring the config over with TFTP is all you should need to do.
Once it's copied to the stack master (double check with the
command), enter
code:use config (filename)
to set it active.
, but DO NOT SAVE - If you do, you'll overwrite that new config with whatever is currently on the switch. When the stack comes back up, it should be loaded with the new configuration you just downloaded.
-Drew