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Plus they seem to have added a Meta box where you just add the full path (if you selected that option) to the image you want to display rather than adding a custom field.
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This only tells WordPress that post thumbnails are supported and adds an option to set the thumbnails in the editor.
Step by step Thesis tutorial about Thesis theme thumbnails, how to show set featured image in Thesis wordpress theme.
Getting ready code auto generate thumbnail feature that grabs the first image in post and display it as a thumbnail for Thesis Theme custom teaser.
Wp Post Thumbnails Feature Thesis Cookie info.
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Once you’ve entered the desired settings, click the update options button to lock them in.Before the slider will work you’ll need to a) make sure to save a few posts into your featured category and b) create two custom fields on each post you want to display in the slider.The fields are as follows: