This is due to the layout of your view or a display option setting you have set up in your view. Certain view layouts and display options do not allow swaps to occur, therefore the tools for swapping are grayed out.
Open up the Views Panel on the right hand side.
Reasons the tools are grayed out:
1)Layout of the view is set to "By date only"
2)Layout of the view is set to "Blocks"
3)Display Option "Show pending swaps" is unchecked
If you do not see any tools for swapping, you do not have access permission to make swaps on the schedule.