You can certainly choose a CMYK or HSL dialog in the fill and stroke and all colour pickers, but it converts all colors to 8 digit hex as you willl see in the bottom of the picker. Since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them.
Fold and press the sides. Working on either the left or the right side of the fabric, fold the fabric over 1.5 inches and pin. Do this the entire length of the fabric and then use your iron to press in the crease. Now fold that edge over another 1.5 inches, pin and press. Repeat that process on the other side of the fabric.
Put in two cells next to each other rather than one above the other. Change Font alignment in one to plus 90 and the other to -90 degrees. Align centred horizontal and vertical. The fold will then be between the cells so might be worth printing landscape rather than portrait.