Each yarn carrier is represented by one of the numbered square buttons at the bottom of the toolbar on the left-hand side of the design screen, as represented in the picture below.
By clicking on one or another button you select the color for drawing. The colors of the buttons can be changed according to the color of your yarn by double-clicking on them.
When we double-click on one of the buttons a new box appears, containing a color palette to choose the color of the button, which will reflect on your design, and below, a bar with the feeder's numbers, that allows us to swap a feeder for another.
The yarn carriers that are currently in use in the design, are outlined with a dark outline. In this case, only the third yarn carrier is currently used in the design.
The yarn carrier that is currently selected for drawing is highlighted by a grey line around the square button. In this case, yarn carrier 1 is selected for drawing. When you're drawing, a yarn carrier is always selected.