You can read about setting up applications for displaying in trades here. To display trades of a single application, select it from the list:

Gel Drop
x1
Spiral Knights
Gel Drop
Type: Material
A drop of goo collected from a jelly. It's still quivering.
★☆☆☆☆
Golden Slime Coin
x1
Spiral Knights
Golden Slime Coin
Type: Rarity
A slippery shekel exuded via protoplasmic alchemy, this coin is usable only at the Golden Slime Casino.
Spiral Knights Items
Spiral Knights
x0
Spiral Knights
Spiral Knights Items