This video is about repairing wobbly chair leg.
While explaining the process of repairing in the video, he says 'ditch the glue' and screw it.
What does the 'ditch the glue' mean?
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"Ditch" means "get rid of" or "throw away" (literally "drop it in a ditch"). It is used casually of things: "Ditch the bags" or of people "He ditched me and went out with his mates".
He isn't suggesting you actually throw away your glue, but that you don't use it for this job (presumably glue isn't strong enough)