When you press the "Continue" button below you will be redirected to the SUPR authentication page. There you will be able to log in with your authentication method of choice, like username and password, certificate or SWAMID, just like when you log in to the SUPR portal to check on your SUPR account or projects.

After you have authenticated yourself with SUPR you will be redirected to the password change page where you will be able to set your Swestore password for dCache. (This password should of course be different from your SUPR password.)