#1 To apply for DX or any other beta, send an email to betareq@microsoft.com. You will receive an auto-response with further details. It may take a few tries before you are accepted. Betas like DX are generally easier to get on than something bigger like Office or the OS betas. But once you are in, you may get invited to do other things as long as you fufill the requirements and give good feedback on any issues that arise.
When you submit your info, you won't receive a reply unless you are picked for something. If you don't get on a beta, just apply for others that are of interest as they come along. It may take patience and some persistence, but don't flood the address :-). One email per beta is all that is needed. Further details will be given in the auto-reply.
Here's a knowledge base article with the details.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q33814
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