If you do not know how to solder, be careful and follow steps precisely because you could otherwise ruin the device.

With the new antenna locate the solder points.

Add solder to the solder points to allow soldering.

Place the antenna at each point and melt the solder point.

Place the antenna solder location into the melted solder blob and let it sit for about 2 seconds.

Repeat this step for each of the solder points.