Change my Twitch profile picture?

I just downloaded Twitch and I already created an account. I can't change the profile picture for some reason. Googled several times, there's always that I should go into the settings and then on profile picture. For me, only: account, preferences, notifications, security and privacy, recommendations, system, terms of use and community guidelines. Does anyone know how I can change my profile picture (without a computer)?

Go over Twitch on your mobile browser and try it?

Yes, just log in to the browser and there you can easily change it to account.

You have to go through the browser, not through the Twitch app.