(adsbygoogle = window.adsbygoogle || []).push({}); I subscribed to a guy today on his channel. As I clicked subscribe a dropdown menu appeared with other peoples links on the channel to subscribe to. Anyone know how to do this?

Yeah, there's a new 'Other Channels' module that hasn't been available to non-partners very long.
Whoever you put in this module, will appear in the drop-down.
Subscribe to my YT as a Thank You