To apply Rates to the Channels you need to connect them to a Rate Plan. In Rates/ Rate Plans, you can click on Create Rate Plan Button, and fill the fields.
You can choose the name as you prefer and the related Unit Type from the dropdown list. In the Apply to Section, if you are going to apply this Rates to the Channels please make sure you tick the Zeevou Channels box.
You can apply the same Rate Plan to the Booking Engine and Admin if you tick their boxes. If you have set Rates for a Rate Plan that does not have Zeevou Channels ticked, those rates will not push to any of the OTAs.