1. Make sure you put Google Analytics code on every page of your website (or at least the pages you want to track). 2. Edit your profile. 3. Go to "Conversion Goals and Funnels. 4. Click on "edit" for G1. 5. Turn on your goal, and choose head match, exact match, or regular expression match. 6. Enter in the string after your domain name. Save changes. It is very easy.
Yes, I am agree with Chopin. Also, you set a particular page of your site ,ex. Thank you page as a goal.