Open PTT. Select Options > Contacts. Scroll right to open the network groups tab. Scroll to a PTT channel and select Options > View.

To edit the channel details, select Options > Edit. You may not be able to edit all channels.

To remove the channel from your PTT contacts, select Options > Delete.

To edit the channel details, select Edit.

To remove a channel from your PTT contacts, scroll to it and press C.