Step 1 lay both cells face up next to each other leaving a bit of space between (about 1/4").
step 2 Connect the three bus on the back of one to the three bus on the front of the other.
Step 3 On the cell that you connected the back of, to the other cell to the front, solder the three bus together at the end opposite where you soldered the other tabs. This will be one end of the circuit.
step 4 turn the whole assembly over.
step 5 on the cell that is connected to the other side connect the three bus together at the other end from where the cells are connected together. This will be the other end of the circuit.