Need to change theme

Hi

I am using Clear Style which is based on Twenty Ten.

My website is: https://www.thetrafficblog.com

I have spent several hours trying to find this out how to change some aspects of my theme but have had no success. I am trying to change the following items –

1. The buttons at the very top of the page are black with white writing. I would like these to be brown with pink writing (as per the button for the page which is open)

2. Directly under the header is a grey bar with a date on the right hand side. I would like to change the colour of this bar and remove the date.

3. At the bottom of the page (and every other page) there is a “Leave a Reply” section which I would like to remove completely.

I would be very grateful for any assistance.

Many thanks
Jacqui