To add a new Content Exchange Channel, from the dropdown menu in the upper left corner, select Editorial / Syndication. Click on the Gear icon in the top right corner. This opens the Application Settings. Click on Importers to expand it.
Right-click on the TN Content Exchange Importer and select "Set As Current Search."
In the Search Field on the left, options for Type, Categories, Flags, and Start Date will load for the TN Content Exchange Channel. Click on the arrow to Expand or Collapse for each option. Select the checkboxes for the Categories you want added and then click on Search above in the toolbar.
Note: Selecting the Categories you want, updates the Content Exchange Importer as new Channels.
Right click on the TN Content Exchange importer and this time select "Update From Current Search."
You'll get a window asking if you want to Update Search Terms, click on Yes (No will cancel it) and then another window will Confirm they have been set.