1. Enter your WordPress dashboard and find the plug-ins box in the left-hand tool bar. Click 'Add New.'
2. Type 'Thesis OpenHook' into the search field and submit your query. The top result should be the OpenHook plug-in. Install the plug-in following the on-screen cues.
3. Return to your WordPress Dashboard. Click the OpenHook plug-in settings link in the 'Appearances' box.
4. Click the 'Header' tab in the OpenHook plug-in and insert the following code where you would like your ad to appear:
Adsense code
Replace 'Adsense code' with your own adsense code. Save your changes.
5. Change the '
' line in the code to '
' if you need to alter the alignment, spacing or margins of your code. Add these additional style elements to the 'custom.php' stylesheet in your Thesis theme, using the tag '#header_ad.'