Your leaf extensions and table top are marked A and B on the underside. The leaf extension marked A will slide into the A side of your table and the leaf extension marked B will slide into the B side of your table.
When installing and removing your leaf extensions, all you have to do is keep them level and parallel to the table top as you slide in to install and slide out to remove. If you find it catches slightly (which is normal) just wiggle your leaf ever so slightly left and right as you slide in or out.
If you experience some sticking over the years of usage, we recommend Minwax Paste Finishing Wax (found at Home Depot or hardware stores) and rub around the rails on your extensions.
NEVER lift or move your table with the leaf extensions attached.
NEVER sit on the ends of the leaf extensions.