To open an account at Interactive Brokers to trade Equities and Forex, simply follow the account opening link and instructions here (hint most people will be applying for an "Individual Account").
For any help during your Broker account opening process you can call 1 (877) 442-2757.
After your account is opened and funded, log into White Shark and add your Interactive Brokers account.
Once you select Interactive Brokers you will be taken to the Interactive Brokers Authentication page. Simply add in your Interactive Brokers username and password and verify that you authorize White Shark. (Screens shown below)
Click open to Open back up the White Shark app. Congratulations, you can now access and trade your Interactive Brokers account through White Shark.
Note: If you are linking a Live trading account then Interactive Brokers will typically take 24 hours to complete the account link.