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 you can enter your email address and password to sign into your account:
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 enter your email address and password to sign into your account: