I’m pretty new here too, but from what I understand you’d need to create a new account if you want to log in to Lemmy.dbzer0.com - however, you can subscribe to communities on other instances from your Lemmy.ml account. Search for the other community by typing it in the search bar like this; !communityname@lemmy.dbzer0.com and then you can subscribe.
You can also go to https://lemmyverse.net/communities, set your home instance to lemmy.ml (or whichever you want), and it’ll automatically link you to the correct place to see it on your home instance.
I’m pretty new here too, but from what I understand you’d need to create a new account if you want to log in to Lemmy.dbzer0.com - however, you can subscribe to communities on other instances from your Lemmy.ml account. Search for the other community by typing it in the search bar like this; !communityname@lemmy.dbzer0.com and then you can subscribe.
Or in the address bar, like this: https://lemmy.ml/c/div0@lemmy.dbzer0.com
You can also go to https://lemmyverse.net/communities, set your home instance to lemmy.ml (or whichever you want), and it’ll automatically link you to the correct place to see it on your home instance.
There’s also https://addons.mozilla.org/en-US/firefox/addon/lemmy-instance-assistant/