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

SpeedRunners Items
SpeedRunners
x1
SpeedRunners
SpeedRunners Items
Fanciness
x1
SpeedRunners
Fanciness
Type: Workshop Item
Market price: ~0.92 USD
The fanciest trail in New Rush City, based on designer Totodile's sister's favourite colours!
Olympus
SpeedRunners
x0
Olympus
Type: Workshop Item
Market price: ~0.89 USD