If your study Administrator has added you to the system, an email will be automatically sent which includes instructions for logging in and a link to the website. 

Occasionally, these emails are filtered by enterprise email systems or other IT infrastructure. If you have checked your spam/junk folder and think this might be happening to you, please inquire with the IT department managing your email system, and have them allow all emails from "webmaster@clsds.com" to go through.