[Gigamo]

On Linux or OSX, just put them under "~/.vimperator/plugins".

The vimperator directory structure is pretty similar to vim's. You can also have a "~/.vimperatorrc".

[RevRal]

I'm using it in Windows.

I've searched for the folders "plugins" and "vimperatorrc."

There is a "vimperator" folder in my documents, but with no "plugins" child folder. This vimperator folder looks like it just contains some history files....

[Gigamo]

You can just create the "plugins" folder if it doesn't exist.