There are different ways of folding a Ruby Cup before insertion. Try them all and find out which one is the easiest for you. Here are two of the most popular folding methods: 

Punch Down

  1. Push down the rim of the cup with your finger
  2. Squeeze the sides of the cup together
  3. Hold the base of the cup to insert

C-Fold

  1. Squeeze the sides of the cup together
  2. Fold the cup in half to make a C shape

More about how to fold a Ruby Cup here.