Step 1 of 3:

solder your pickup’s “+” to the far left lug on the Volume Pot

Step 2 of 3:

Solder your pickup’s ground aka “-” to the casing of the tone pot. If Installing a braided wire pickup make sure the braided part is pushed away from your hot joint

solder the wire coming from your guitars bridge to the casing of any pot. On this example the volume was the closest.