I watch Twitch from PS4. All settings cannot be changed easily, so you will have to use your mobile. I'm Twitch Prime but I can't send free subscriptions from PS4.Response is slow because it is a controller when interacting with the broadcaster. Twitch is hard for people without PCs.

As a solution, if you link the PS4 application to the mobile, you can easily send chats etc. And I think that you can easily send subscribes etc. I think it's strange English because I use translation. Excuse me. I hope the switch is better now.