If you're accessing your account on the desktop version of the website, you can find the Account link in the top-right corner of the main menu:
From here, enter your email address in the white box and click Continue:
You will be sent a unique one-time code to your provided email address to sign into your account:
Enter that 6-digit code in the box on the log-in page and click Submit to log in:
If you're accessing your account on a mobile device, open the menu via the 3 lines in the top right corner of the screen:
The Account login link is in the bottom right corner of that menu:
From here you can follow the same process as above to enter your email address and receive a unique onetime code via email to sign into your account: