Ok so the SSR are triggered via the green pigtails (5V digital outputs). Flip over the BPi and you will see a wiring diagram that shows the +/- for each pigtail. You will take two leads from the pigtail and connect them to the corresponding +/- on the input side of your SSR (take a look at this pic for reference https://store.brewpi.com/temperature-control/solid-state-relays-ssr/ssr-40a). That will handle the switching of the SSR from open to closed. On the opposite side of the SSR is where you will wire in the outlets; hot from power source to one side and the other to the hot on the outlet itself (in the picture link this would be HOT from source to 1 and 2 would go to HOT on outlet). The rest of the wiring on the outlet is normal from the source power, neutral to neutral ground to ground.
If you do not feel comfortable with this PLEASE DO NOT PROCEED, find a person local that can walk you through it or do a lot of youtube'n and make sure you understand how electrical circuits work.
I hope this is of some help.