Trade Window

Buttons
Item Tabs
These consist of Furnishing, Pins, CLothing, and Posters. Clicking on these tabs will change the items in the item box (The item box is the large box between the item tabs and trade windows that can display up to 14 items at a time.
Accept Buttons
To accept a trade, click the little blue box next to "You accept". A small X should appear in it. Sometimes you will be asked if you're sure you want to make the trade. Once both players have accepted, you will be asked one final time if you want to accept the trade.
Ask to be friend / Stop trading
These buttons are self explanatory. The first asks the other trader to be your friend, and the other closes the trade window.
Putting up items
Click objects in the item box and they'll appear in the trade window. Click items in the trade window, and they'll appear in the item box. It's as simple as that!
Trade Window
The objects in these windows are the ones that will be traded. Make sure to pay close attention to items in the other person's trade window! Sometimes, they'll try to scam you by pulling out a rare item from their window at the last second.
Chat Window
Talking in trade is exactly like in other places. Keep in mind there's still a dictionary. The only difference is that it will tell you when an object has been added to/taken away from the trade window.