This is mostly simple with this set. The O is the only bit that is tricky.
The grid frame takes 2 rubber bands.
different rubber bands can be used, so do experiment.
Take a rubber band and loop it over two of the holes as pictured.
Repeat for the other set of holes.
Take a rubber band and hook it over two of the holes on one side.
Twist the bands once to form a cross with the band.
Hook it into the two remaining holes.
Done, simple.
For this you will need a wire/plastic food tie.#, 2 bands, the O hammer and the O frame.
A food bag tie is the best thing I can find to do this.
Hook a rubber band through the food bag tie.
Then loop the band over two of the holes on the frame.
Feed the food bag tie through the O hammer.
Hook the band over the other two holes in the frame.
Repeat the process with another band and the remaining two holes on the frame.
Be careful not to hook the first band with the food bag tie when you go through again.
All done.