Easy to attach
Place a SmartSeat on the seat of your chair with the longest straps hanging at the back. Wrap one of the long straps around the outside of a back leg, and then between the two back legs. Repeat with the second long strap on the other side. Both long straps should now be hanging between the back legs under the seat of the chair, ready to be connected with the front straps.
Now take one of the front straps and pull it either between the front legs (as in picture 2a) or to the outside of the chair (as in picture 2b), depending on which method works better for your size and style of chair. If you find you have extra fabric at the front of the chair, try tucking some under the fold that is created when performing this step (see arrows in pictures 2a and 2b).
Connect a front strap with a back strap under the seat of the chair as in picture 3a (for larger chairs) or cross the straps under the seat of the chair as in picture 3b (for small and medium chairs). Repeat with the remaining 2 straps. After all 4 straps are connected, you might want to smooth the material on the seat or pull the straps tighter to get the best fit.