Fix Cache Key?

[Daisy]

Ive moved my site to a new hosting company today, it appears to be working fine which I find amazing as Ive never done this before, then Ive got to the the fix cache key bit !!! Ive downloaded the utility, but have no idea where to upload it, it states 'where index.php exists' well i have a couple of them so i thought the cache folder would be right one as i have an index.php there, so i put it there, so not only do i have any idea if thats the right folder or not but also i have no idea how to run it.
I wonder if someone could explain it in easy terms to me
Thank you

[stevesh]

It would go in the root (top) directory of your store.

[Daisy]

Thank you Stevesh :-)

[swguy]

... and be sure to delete it once you have run it.