Many sites allow you to create an account if you don't already have one. Depending upon the site settings, you may need to be approved before you're able to do much with your account (being able to see member only content, create content, etc).
In some instances your domain may be set as "pre-approved," in which case by creating an account using your email address, you'll automatically be granted the access you need.
If you have questions about how your site is set up, see your organization administrator or contact Digital Deployment and we'll help you figure it out.
If you haven't been set up with a user account yet, you maybe be able to create an account by going to [yourdomain].com/user/register, or by hovering your mouse in the lower left corner of your screen and clicking on gear icon that magically appears, then choosing the "create new account" link in the box that pops up:
Typically you will be sent an email with a link. Clicking the link confirms that you're a real person, and allows you the access that matches your site settings. Again, if you have questions about creating new accounts on your site, check with your organization admin or with Digital Deployment.