On desktop (MacOS and Windows) or on Wire for Web:

1. Click People  to show the search field.
2. Type the profile name or username of the person you want to contact.
3. Select the person from the search results.
4. Click OPEN.

On mobile devices:

In the conversation list:

1. Tap People  to show the search field.
2. Type the profile name or username of person you want to contact or tap their avatar.
3. Select the person from the search results.
4. Tap Return or OPEN.