Select item from options or write the item name by yourself.
Options depends on the selected category.
You have to write the whole English name of an CS:GO item, e.g. Sticker | North (Gold) | 2020 RMR
You can also paste the item market link of any commodity item into the input box. (From CS:GO, Dota 2, TF2,...)
or https://steamcommunity.com/market/listings/730/Sticker | North (Gold) | 2020 RMR
Unfortunately it's case sensitive and doesn't work with skins :/