EvE Account link with Twitch Account

Hello,
I am pretty new to this game, but i see on Twitch some offer over Twitch Prime.
U have to link your Twitch acc with the EvE acc, but i have no idea where i have to do this?
Sure in the account settings, but where?

You do it via the link in the twitch page of prime rewards collection:

https://twitch.amazon.com/tp