Comment by cesarb

> I have to copy his profile url and paste it in my logged in instance.

It used to be different; in older versions of Mastodon, when you clicked on the Follow link on another instance, it asked for the name of your home instance, and redirected to a pre-filled follow screen on it. This was probably changed because it's an obvious phishing risk: it could redirect you to a fake domain which asked for your Mastodon account credentials (as if your login had expired), so it's not good to get people used to that kind of mechanic.