How do you do a tr2tog treble 2 together?

To perform a tr2tog (treble two together) stitch, first yarn over twice and insert your hook into the designated stitch. Yarn over again and pull through, giving you four loops on the hook. Yarn over and pull through the first two loops, leaving three loops on the hook. Yarn over and pull through the remaining three loops to complete the stitch. Repeat this process for the second stitch, and you'll have successfully worked a tr2tog.