I need to know how to do professor's nightmare. Can anyone help?

There have been several threads on this one. Go to 'search' at the top of the page and do a search for it. Be sure to spell Professor with only one f. It will make a difference!

In addition to the search here at this web site, it can be purchased from every magic dealer world wide under different names. I would dare say it's the most common rope trick ever performed.

I may refer you to Daryl's Expert Rope video. There's a version there, too.