To log in to your Waves account, simply open Waves.Exchange and click “Log In” in the top right corner. You will be forwarded to this page, which looks like this:

Enter the password in the “Password” field and click “Continue“.
If you don’t see the log in link and have a link to “Get started” instead, click there. You will be asked to create a new account or to “Import accounts“. This may come up if you use Waves Exchange both as an application on your computer, a mobile app or the website, or if you have more than one account in Waves. Select the import option.
Select to import your account with “Seed or Key“.
Then enter your 15 word Seed, which you must have stored in a safe place, and click Continue. Select your account name and then click Continue again, and you are logged in.