How do you get rank 3 in Megaman 3?

After getting Rank 7, Chaud e-mails you saying that you have a message on the ACDC BBS. Check it. You'll learn that Rank 3 is looking for you and will meet in Undernet 4. To get to Undernet 4 you need to go through Undernet 2. Talk to the navi at the top and he'll let you in. Take the warp point to the green level, then the blue level. DON'T go to Undernet 5. Warp around the blue level till you reach the slope, go down, and enter the cutscene. After fighting Gutsman beta, you receive Rank 3.