Trying to connect wifi and won't accept password

I just got my inspire today. This happens to be my first smart phone and I'm kinda dumb when it comes to, well, pretty much anything that isn't calling or texting on my phone . I keep trying to connect my phone to my home wireless internet but it keeps saying that I'm entering the wrong password when I KNOW I am putting in the right one. This is very frustrating to me. I haven't really been able to try out my phone at all because I can't even get a signal at my house to use the phone's internet. If you have any ideas for me I would appreciate it. Sorry for my ignorance in this department .

Thanks for the reply. I figured it out though. Ended up having to reset my router. Not sure why, but it works now.