Same as any type of local image, under the "local" option, "select folder..." that contains the gifs.
What's causing problems?
Viewing post in Heat Control - edging trainer comments
you enter it the same way you would do on a E621 search! A example being, since my prefrence is furries and gay as a gif, amd to add something as a example or a result for two words ill use Deep Throat id have it as " anthro male/male deep_throat type:gif "
Than the 'Number of pictures'part, you just put how many pictures youd like there to be to go through :) if you want all the pictures for that result, just put the max amount for pictures.
Just make sure to black list what you want in the black list part so you domt get anything you dont like