Feed them all with one feedline. Use coax. If you have RF in the shack or you hear a lot of interference from your household devices, try inserting a 1:1 balun at the feedpoint. Do not use a transformer balun (eg. 4:1 or 9:1). The impedance on each band should be a good match to 50 ohms so there's no need for impedance transformation! Many thousands of us started out with these as our first good antennas, and it is a mystery today why so many new hams reject them out of hand. Whatever the manufacturer suggests. Get in the habit of reading instructions and manuals to get the answers to questions like this one; that is the surest way to success.