Step one go to experticity

Enter your email and click "apply"

Then enter your first and last name, (email that you input on first screen should be auto-filled here) Make a password to use. This isn't a special password, just something that you find appropriate.

After that it will take you to a couple more forms for making your profile. After that join the group to which you belong. If you are an Army veteran find the U.S. Army group and apply. (There are instructions on how to do that)

Hope this helps!

Cheers!