I have a question about Javascript.

I need help with JavaScript enabled.
My job so that I can automatically send button to be pushed faster.
I use google chrome.

For example;
Automatically have form filling add-ons. (Autofill), but only to fill the send button will not print.
How can I do this automatically?

Button codes;
<input type='submit' name='post_shout' value='Shout' class='button' />

Google Chrome address bar: javascript: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx what I need to write here?

Can I do it after 1-2 seconds and fill out?

Many thanks in advance.
(My English is poor)