Posterous
Overview
Adding sharing buttons to your Posterous page easy. Just remember to follow these three simple rules:
- Register - You'll need to register (it's free!) to obtain a publisher key for your button.
- Get Button - Choose a button from our Get Button Page to generate your code.
- Add Your Code - Paste your generated code from the Get Button Page to your Posterous page following the instructions below. Done!
Getting The Code
If you haven't already done so, we suggest registering first. If your already a ShareThis user, go ahead and sign-in. Once you've signed in, navigate to the Get Button Page.

Customize
Click here to log in to your Posterous Manage Page. On the left hand side, choose your website

Choose Theme
Click on Theme My Site link under 'Actions' in the middle of the page.

Advanced Section
On the top left navigation, click on Advanced link.

If you haven't made any changes to your HTML before, you should see a message with a link to 'Enable advanced theming'. Clicking on that, it will ask you to confirm a name for the customized HTML. Enter the name you want and click on OK.

If you have made changes previously or you have followed the above step, you should see a preview of the HTML load on the right.

Below the code preview, on the right side, click on the Expand link. The code preview should takeover most of the screen.

Search for {block:Responses /} on the page (the easiest way to do this is to do a ctrl+f - which should let your search the page for text). Now add the code section 1 (the a tag) right before {block:Responses /} (this will place it right after the post content).

Finish
You are all done. Click on the green Save, I'm done! button on the bottom right. You should now see the ShareThis button on your blog