Amateur spelunker needs help

I’m trying out cave climbing for the first time, in Skyfox Den. I’ve spent the past half hour falling from stalactites while watching video guides and searching Wowhead and the WoW forums for the answer to how to not detach. The closest I’ve come was a comment on Wowhead that says I need to use my prevent hazard button to stop the slyvern breath attacks from dislodging me, but I don’t know where this button is. I’m guessing this is something most WoW players just know already or it’s called something else in game? Any advice to help me not have to give up on my spelunking career before it’s even begun would be much appreciated.