How do you send someone a message on twitter?

[Person]

I guess I dont get it. I was going to send someone a message or tweet or what ever, so i look at their page and no where is there a place where i can actually send a message or leave a post on there wall. Could someone give me a Twitter for Dummies crash course? thanks

[NERD]

twitter is dumb

[Hisham I]

If you want to message someone do this : @the user name that you want to send,then do it like your tweeting something. If you want to do a direct message then you have to follow them and they have to follow you.Then go to your homepage and click on direct message link. Then click on the drop down menu and then click on the user name that you want to send it to.Then type your message then click send.