Small customisations to the plug-in

Hi there, I wanted to make some minor changes to the plug-in on this page: http://maddyreilly.co.uk/appointment-test/

1. I would like to remove the excerpt below the appointment chosen

2. Change the text

OUR SCHEDULE FOR NOVEMBER 2012

3. Change this text

Click a free day to apply for an appointment.

4. Price is also in USD but I need £GDP or Sterling.

5. How is it best to adapt the css? For example I would like to update

class="appointments-confirmation-button"

by adding:

margin-right: 4px;

Would I do this in the Additional css Rules ?