I’m trying to complete some badges in order to gain more levels so everything becomes more accessible. One badge asks me to react to one of the posts. Can anyone tell me how to do that?
Edit: Alright, thank you for the replies, everyone. I figured it out thanks to you.
Click on 
symbol below post
Just like this 
Use the shocked emoji 
and peoples posts with the heart button below each post.
thank you very much for your replies!
Someone can tell me how i get a profil picture?
Please
go to preferences there you can update your profile pic
Just comments and likes
Just like this
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All good