Short Answer 
To manage messages in Twitch chat, streamers and moderators can use the /delete command to remove individual messages, utilize the “time out” function to temporarily prevent users from chatting while deleting their messages, and configure Automod settings to automatically delete messages with specific content.
Step 1: Use Chat Commands for Individual Messages
If you are a streamer or a moderator, deleting individual messages in Twitch chat is straightforward. Simply type the command /delete [message ID] where [message ID] is the unique identifier for the message you want to remove. Make sure you have the necessary permissions to execute this command in the chat.
Step 2: Utilize the “Time Out” Function
Moderators can temporarily remove a user from chat using the “time out” function. This action not only prevents the user from sending further messages but also deletes all of their previous messages within the chat. To use this feature, find the user’s message and select the time out option that is usually available through a menu or right-click action.
Step 3: Configure Automod Settings
For a more automated approach to message management, streamers can set up the Automod feature. This allows you to establish filters that automatically delete messages containing specific words or phrases. To adjust these settings, go to the Creator Dashboard, navigate to Settings, and then select Moderation to customize your preferences for chat management.