They are two different accounts with different places to login and different login credentials. One account as you, the coach managing your clients, and a second account (with a totally different username and password) to access your coach's private client website to complete your forms with your coach, schedule appointments, make payments, etc. This is not a second Coaches Console account, though. This second account is an account with your coach to access their private client website.
To login to your Coaches Console account (to manage your clients, communications, billing, schedule, etc), you go to coachesconsole.com and click on "Members Login" (or directly to coachesconsole.com/v3/). But you will need to go directly to your coach's specific website URL and click "Login" on their website to access their private client website area and complete for forms, etc.