You're going to want to be in the #trading channel on our slack. You can get an invite to the slack at https://slackin.sia.tech

There is currently no siafund support in the GUI, siafunds can be used through the cli only.

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How To Migrate Coins from 0.3.3.x Wallets

0a. Don't run 0.3.3.x software. Doing so risks triggering bugs that can destroy coins.
0b. Create backups of everything before loading anything. Don't delete any backups until you are 100% sure that the coins have been properly recovered.
1. Find the wallet.dat file that has the coins. Make sure that you grab the most recent one - backups may not contain all of the coins. (It's okay to try loading both the most recent one and the backup one)
2. Load the wallet in to the 0.4.x software. In the GUI, there's a 'load legacy wallet' button you can use. With siac, you can use the 'siac wallet load 033x' command.
3. When asked for a password, provide the password for the 0.4.x wallet. The 033x wallet is unencrypted, you are being asked for a password so the 033x wallet can be encrypted.
4. repeat for every wallet and backup that you find. It's okay to load the same wallet multiple times, and to load the wallets in any order.
5. After loading all of the files, restart Sia. Make sure that 'siad' closes all the way, you may need to kill it in the task manager.

As long as you follow step 0a and 0b correctly, you have no risk of losing coins, even if you mess up on the later steps.