How do I edit send button

I would like to have the send button a little small which right now is bigger than the form box. I also would like to make the form size also a little bigger and even to another email tab on right.
I have used this simple code.

`<label> Your Name (required)
[text* your-name] </label>

<label> Your Email (required)
[email* your-email] </label>

<label> Subject
[text your-subject] </label>

<label> Your Message
[textarea your-message] </label>

[submit “Send”]

The page I need help with: [log in to see the link]