1. News

A survey via news can be created by users who have the authorisation to share news (usually all teachers). 

2. Chats

The admin of the respective chat group can create a survey in the chat.
To find out who the group admin is, go to the group's member list.
To do this, open the "My groups" overview using the drop-down menu at the top right. Then select the group you want. Here you can see the list of members and see who the admin is. There can also be several group admins in a group.