Within Teamwork Chat, you can filter conversations, channels and the list of users.

To filter a conversation or channel, click on the Home tab from the navigation bar. Enter your filter term into the Filter conversations field.

To search for a channel, click on the Channel tab from the navigation bar. Enter your search term into the Search channels field.

As you type your filter term, the results will automatically update.

Once you have found the conversation, channel or user you are looking for, just click on it to open that chat window.

To go back to the full unfiltered list, click the x to the right of the filter field, or switch to a another tab. 

For more information see: Editing and deleting messages