Is it really true??

am I really coming to the end of all my computer problems?? Not quite...almost...but not quite. Here's the problem. I finally have both my laptops at home and now I'm trying to set up the wireless router. It seems to be working on the HP but I can't seem to log into it on the Mac. It gives me the option of logging into it but then asks for my password and I enter what I think should be my password but it says it's incorrect. I don't get it. I'm positive that I'm using the right password but I guess not and I don't know how to change it. Anyone know how to change a password to a wireless internet connection?? I can't figure it out and when it comes to computers my brain turns into knots and I want to throw things I get so frustrated. Help me!