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Simple example for holding in the user information.
Create a new form within your project and when the user enters the information correct, you need to create a new thread:
using System.Threading;
Create a new thread while using Form2.ShowDialog();
Close current form leaving the new thread open with the new form.
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If you are still confused you can take my source here:
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And manipulate it to how you need.
The concept will be the same except take the register form and make it your new main form.
If you still need help, quote me. It's 1:20am right now and I'm not in a position to write up a project source.