An F-clef with a figure 8 symbol added below the clef means: play all notes one octave lower than written.
The top staff (played with the right hand) has an F-clef with a figure 8 symbol added below. This means: play all notes one octave lower than written. So, you cross the right hand over the left hand and play the two lowest E's on the piano.
View here the explanation of the G-clef with a figure 8 symbol added below.
For further explanation, I have made a new chapter in Elementary Music Theory level 2, namely Chapter 2.1 Musical notation. Here I also give a few examples.