Spread the glue with both a little bristled brush or a thin bit of scrap stock that may fit to the tails conveniently. Coat all 3 edges of each of the dovetails with a skinny, even layer of glue. Clamp the drawer with each other in each directions. Look for https://devinimquw.smblogsites.com/30305199/the-smart-trick-of-dovetail-drawers-that-no-one-is-discussing