Picture Tutorial
I used red thread so it would be clear, but I usually use tan thread so it isn't noticeable in the aquarium.
Step 1. Lay out plant, rock, thread, scissors.
Step 2. Twist thread around and around the base of plant.
Step 3. Spread roots, nestle rock up in center.
Step 4. Wrap roots around rock.
Step 5. Secure with thread. Crisscross thread to bind roots to rock.
This is what the bottom of the rock looks like.
Good luck! Hope the photos help!