CLI - How do I use 'supabase link [flags]'?

flags means Reference ID, right?
If my Reference ID is ABCD,
This is https://app.supabase.com/project/ABCD.
So I entered the command 'supabase link --ABCD',
It doesn't work.

There is no guide on this.
Existing guides are too short of explanation.
No consideration for newbies at all.

What should I do?
Supabase Studio
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