You need to include the exif tags in the image_template.html file of the Horizon template.
Open it in a text editor, then scroll down to around lines 36-37 - code at that point should be:
<div id="image_notes">
<IMAGE_NOTES>
After that, add the following:
<div id="image-exif">
<EXIF_CAMERA_MODEL><br />
<EXIF_EXPOSURE_TIME><br />
<EXIF_APERTURE><br />
<EXIF_FLASH><br />
</div>
These are just examples of common exif tags that are used in templates - you can change or add to them as need be, so long as you include them before the closing div tag.
In your stylesheet (horizon.css), add the following:
#image_notes #image-exif {
padding-top: 10px;
text-align: left;
vertical-align: top;
}
That will style the div that the exif tags are included in. Make whatever changes necessary (padding, etc.) in order for them to fit in properly with the rest of the information in the left column.
If you have any questions or problems, post back here and I or someone else will try to help you out. :)