We have re-implemented the removal of worm sell orders from exchange.
For now its only possible to remove small worms from exchange if you have them set for sale.
To remove small worms you have set for sale:
1) Go to:
2) Click remove button next to sell order of worms
If everything goes well then in few days we will implement the removal of sell orders for other types of worms (Tasty, Enchanted and Magic).