How to post a message to a blog,forum or website

[LadyTrucker2015]

Trying to get free boost mobile phone card. I have to post message below on 3 different blogs,forums or websites. I don't know how to do that cuz it won't let me type in anything. I took a screen shot if that will help

 

[B. Diddy]

Where are you trying to post, and what do you mean that it won't let you type in anything? Are you registered on those forums? Most forums or blogs require that you register before you can post something.