[Q] A noob needs help... topic

Hi, so I was trying to root my phone using method 1 of this guide: galaxys5root.com/galaxy-s5-root/how-to-root-galaxy-s5. Just when I got to my very last part where I had 15 seconds to grant access, I was busy looking at my computer screen and didn't notice it, so it just went away Denied... What do I do to fix this?