To use Mendeley Reference Manager, you need to create an account, it’s free. Creating a membership account 5 steps:

Steps 1-2: Open the mendeley.com websites (1) > click on Sign In (2).

Step 3: Enter your email address and click Continue (3).

Steps 4-5: Fill in your membership information (4) > click Register (5).

Step 6: Click on Continue (6).

A free account has been created.

To view your account information, click on account icon (1) > Settings (2)

You can view the details of your subscription under the Subscription option.

If you sign up for a free account while using a university's internet network, you will subscribe to Mendeley Institutional Edition (MIE) automatically. You can enjoy the benefits of this subscription even if you don’t use an institutional email address. To become an MIE subscriber, simply log in or sign up through the university network at mendeley.com. For providing this subscription, your university/institution must be registered under the institutional Mendeley agreement for this to be possible. You can check with your library to see if the agreement is in place.