How do you remove a single lever Delta bathroom faucet handle with red and blue sign?

To remove a single lever Delta bathroom faucet handle with a red and blue sign, first, locate the small set screw on the back or underside of the handle. Use an Allen wrench to loosen and remove the screw. Once the screw is removed, gently lift the handle straight up to detach it from the faucet body. If it’s stuck, you may need to wiggle it slightly or use a cloth to grip and pull it off.