Using the Trade T$/W$ link above you will be directed to the trading page where you can calculate how much your trade is worth. Select the trade you want to make(Buy or Sell, T$ or W$) and enter the quantity you wish to trade, then click to calculate the rate, and the amount will appear below. No matter what quantity you have to sell, I am happy to buy them from you.

Since all exchanges are made directly through the PokerStars main lobby, it is 100% safe for both parties. Once identical requests are submitted by the involved players, the exchange is automatically made and the cash will be in your account at that time.

At the main lobby of PokerStars if you click on 'Requests' and drop down to 'Registered in Tournaments' this will have a list of events you are already in. Go to the tournament lobby for the event you just won a satellite to and click on unregister in the bottom left. The buyin for that event will be credited to your account, click on the cashier screen and the T$ or W$ will be displayed in the area below your personal information.

T$ are won by qualifying for either of the $1 Million guaranteed tournaments held every Sunday with respective entry fees of 215 and 530. The tourney held weekly is 215 and the 530 buyin is held monthly only on the final Sunday of each month. If you unregister from the event which you win an entry to, your account is credited with the respective amount of T$.

In order to earn W$ you can win satellite events to any WSOP, WPT, EPT, or WCOOP events. The same process must be taken in order to have your account credited with W$, unregister from the event and you will have the buyin for the tournament you unregistered from in W$ available in your Cashier.

An official explanation is provided on the PokerStars website