Sign in to your AdWords account at
http://adwords.google.com.
Click the Tools and Analysis tab, and select Conversions from the drop-down menu.
Select
Under the Conversions tab, click the +New conversion button.
All conversion types
In the "Conversion name" field, enter the name of the conversion you'd like to track on your website. This will help you recognize this action later when it shows up in conversion reports. An example might be "newsletter sign-up" or "wedding bouquet purchase."
New conversion
In the "Conversion location" field, select where your customers will complete the conversion. For example, if customers will order your cupcakes on your website, you'll select "Webpage."
Click the Save and continue button.
On the next page, in the "Conversion category" field, select the category that best applies to your conversion. If you're tracking newsletter sign ups, you'll pick "Sign up." For purchases, you'll pick "Purchase/Sale." If your conversion doesn't fall into a listed category, select "Other." Your choice here won't impact the way your conversions are recorded.
Conversions settings
In the "Page security level" field, select the security level of your conversion page. For example, if the "Thank you!" page that pops up after customers buy your flowers has a website URL address that starts with https:// (meaning a secure page), then you'll select HTTPS from the drop-down menu.
If you'd like to, in the "Conversion value" field, assign a value to the conversion you're tracking.
In the "Tracking indicator" field, choose whether you want to let your customers know that you're using conversion tracking by putting a Google Sites Stats notification on your page.
Tracking indicator
If you'd like to add a notification, select "Add a 'Google Site Stats' notification to the code generated for my page." Then select whether you'd like your Google Site Stats to be one or two lines, the language of the notification, and the background color of the webpage it'll be displayed on.
If you prefer not to use a notification, select "Don't add a notification to the code generated for my page." But we require that you inform your customers that you're using AdWords' free conversion tracking feature (such as through your privacy policy). This creates trust and protects their privacy.
If you're not running a Display Network campaign, skip to the next step. If you are running one, you can click the +Advanced options link to set up View-through Conversion tracking.
Click Save and continue.
Select "Someone else makes changes to the code" or "I make changes to the code," depending on which applies to you.
If you chose "Someone else makes changes to the code," just fill out the email form that pops up and click Send email. The code snippet will be sent you the person who edits HTML for your website!
If you chose "I make changes to the code," a window will open up below with your code snippet. Congrats! You've generated the code. Copy it, and you'll be ready for the next step.
THAT comes from Google. Once you have your code, paste it into your theme-->template-->common-->success.tpl