If you wire the subs in parallel, it will make a 2 ohm load. If you wire them in series, it will make an 8 ohm load. Check you have an 8 ohm rating on the amp.
To wire in parallel, you connect the positive (+) from the amp to the + on both drivers. You can run two wires that are both connected to the amps + output or you can run a wire from the amp to sub1 then a wire from sub1 to sub2. Then do the same with the negative (-) side. Since your amp isn't rated for 2 ohms, I wouldn't recommend this.
To wire them in series, run a wire from the + on the amp to the + on sub1. Then run a wire from the - on sub1 to the + on sub2. Then run a wire from the - on sub2 to the - on the amp.
When you have more power available than the sub will take, you have to control the gain to keep from blowing the drivers.
