If you wish to move a player to a different channel (so that you can show the content in the new channel's playlist) these are the steps to follow.
Click on the Networks button down the left hand side, then from the tabs at the top of page (Players, Player Group etc) select the 'Channel Association' tab.
In the more central left hand menu select the channel that you wish to move your player to. On the right hand side you will see the players that the channel already has associated to it.
To associate your player with this channel, click on the player and drag the player upwards and release in the channel space above. The player should now not only be visible in the 'Connected Players' section but should also be now in the associated section.
If the player is already connected to another channel, a message will pop up asking you if you are sure that you want to associate the player with a different channel. Answer 'Yes' to move the player to the new channel. The player is now associated with this channel.