Anyone can create public channels, private channels, direct messages, and group messages unless the System Admin has restricted permissions to do so using advanced permissions.
Automate with channel actions
The user who creates a channel automatically becomes the Channel Admin. Channel Admins can access Channel Actions from the channel name drop-down menu in the center pane to configure automatic actions when users join the channel or post a message to the channel.
Automatic actions include:
Displaying a temporary welcome message for new channel members.
Automatically adding the channel to a category in the user’s channel sidebar.
Prompting to run a playbook based on the contents of a message.
To create a public or private channel, select the + symbol at the top of the channel sidebar, then select Create New Channel.
To start a direct or group message, select the + symbol next to the Direct Messages category in the channel sidebar.
Alternatively, you can select the + symbol at the top of the channel sidebar, then select Open a Direct Message.
In the Direct Messages popup, identify your most recent conversations by relative timestamps.