Step 1: Remove the back cover of the S5.
Step 2: Remove the double sided tape from the S5 SlimPWRcard.
Step 3: Attach the S5 SlimPWRcard to the back of the battery firmly, ensuring the contact pins are properly connected to the bottom 2 connectors on the phone.
Step 4: Reattach the back cover of the S5.
Step 5: Place the S5 on top of Qi wireless charging transmitter.
Here is an instruction video: