Subdomain take over with github?

I have a username on github "as my name is" and also a subdomain like otherusername.github.io and on this Subdomain github error pages there, so I search on google and found that the subdomain is vulnerable to subdomain take over, now the big question is How i claim on it?.

Is i create a repository on my profile with that name "otherusername.github.io? And that's all." If so then what do next?

I want to clear this doubt.