Search tab
On search tab you can find offers from other players. To help you find certain mods use filters.
Setting tab
Customize addon for some features. You can offer mods for you guild members only by using specified channel names.
Mini-button
Use this button near mini-map to open or close ModTrader. You can replace that button and hide it in addon settings.
Sell tab
Scan your bank for mods to offer. You can specify slot numbers by range.