How to link a single clip?

Hi,it's maybe a stupid question but how you link a single clip to a footage??i know how to link a collection but can't find how to link a single clip... Help please...

It's like voicing "The sound of clapping one hand". Instructions found in Buddhist kōan.
Well, try clicking the Clip button below, Choose 3 when in doubt.

Oh what a shame!!!...as i use to fill description box in the upload page i didn't notice it...Sorry...