Attach Bluetooth transmitter to the breastplate, neck strap, or grab strap on the saddle. Add lube to top (shorter) electrode and place under the saddle pad, on the horses back. Placement of this electrode can be tricky, but it seems to stay best when placed right below the dip of the withers under the panel of the saddle. It can also be placed further back under the saddle. Add lube to the bottom (longer) electrode and connect it to the girth of the saddle. We like this electrode to be low on the horse, right above the heart area. See a video here
The electrode set comes with two rubber connectors. One is generally large enough for most girths. Be sure to tighten the girth to keep the electrodes from slipping. Too much movement of the electrodes can cause unwanted heart rate variations. The wires can be pushed under the saddle, between the saddle and saddle pad, or they can be left alone.
For more on troubleshooting monitor issues, click here.