I can't see that clearly, but you've got a 12V power supply, PID and SSR.
Can you get a picture of the sticker on top of the PID so I can see the terminals?
But if that's like the similar PID's I've seen then it will take a direct feed from the mains, probably into terminals 1&2. If this is the case then it's an easy wring up job with what you have (explained below). However, if the PID takes 12V and the power supply is intended to feed the PID, then you'll have to do things a little differently.
Connect PID to the mains using the correct terminals (1&2?)
Then you wire the input side of the SSR into the correct terminals (6&7?).
Now assuming the terminal numbers above are right, jump a wire across from terminal 1 on the PID into one of the output terminals on the SSR. Connect the second output terminal into the input of your power supply then complete the circuit by jumping back across to terminal 2 on the PID.
You can then connect a DC blower into the output of your power supply and hook up a temperature sensor. Get these into your pit and you're in business.
Just to add, with the kit you have you'll be playing with mains electricity, 240V can kill you or worse could kill me when I come to have a look at your controller in May Please make sure you do all your connections properly and earth everything that needs to be earthed, you need to assemble your new toy in a suitable box too. If in doubt, bring your box of bits in May and I'll be happy to wire it all up for you safely.
Also worth noting that SSR's work differently to mechanical relays, when the circuit is closed they do like to produce heat, you may need to consider this when installing your setup into an enclosure.