Federation is automatic unless your instance is using a whitelist setup.

If I understand it right, federation happens automatically when someone from a new instance interacts with the home instance, or someone from the home instance searches out the new instance.

It looks like that site might be running with the British use of "skinhead" and not the U$ use. It was a progressive punk/ska subculture before it became used as a white supremacist thing in the U$.

In Europe we have red skins (leftists) and apolitical skins, so being a skinhead is not equivalent to being a nazi (although we also have naziskins unfortunately)