Go to the Members only area.

Please contact to have you existing email added to the access list, or to obtain a @mlsp.org account/email address.  This email address can be configured to simply forward to your existing account.

Once your email address is added to the access/mailing list please create a Google account with it.  After that you can access the Members Area by clicking on:

Don't have an account at mlsp.org? 
Sign in with a different account

which can be found at the bottom of the yellow sing in box.