When you first boot the Pixel desktop you’re asked to change the default password. You shouldn’t just set it back to ‘raspberry’ because these credentials are highly public, so any malware downloaded could leverage them and turn your humble Pi against you. This is especially true if you enable remote access, as we’re about to. This will enable you connect to your Pi from another machine over the SSH protocol, allowing for all kinds of remote operation and administration possibilities.
From the Applications menu (top-left) select Preferences, then Raspberry Pi Configuration. From here you can set hostnames, display settings… all sorts of things. Head to the Interfaces tab, which lets you enable remote login (and desktop via ) as well