Need Help With Tweet Adder

I just looked at a tutorial on how to automatically retweet others and when I put in the name as it appears on their page I am told it is invalid to add anything but letters, numbers, and underscores. I try adding the name and I get that message. I trying adding their address on their page and I get that message. The tutorial put in the same type of code that I put in.

Arghhhh! Any help? Thanks