I made up some coffee sleeves but I have to join them yet. I have a brother se270d and just can't figure out the settings for the right zig zag stitch to join them, would anyone know what setting I need to use? Thank you very much!

I don't have your machine,,,,but I would use a fairly wide zig-zag, with a very small stitch length (.5 or lower). If you have a foot that allows "raised" stitches to pass under use that. My foot is a clear plastic with a wide opening. On the bottom (underside) there are metal strips that slightly raise the foot. I hope this helps.