Hi Leigh, the first thing you should try is to completely remove the damaged link,(drill it out if necessary) and buy a removable link to replace it; (the same as the one used to remove the chain) next to the broken one in your pic....Next,loosen the nut on the black plastic chain tensioner and slide it down as far as it will go in it's slot.
Replace the chain and it should join up correctly for you.
Retension it with the slider to retain about a half an inch of slack and re-tighten the nut.
Down the track, you really should buy a new chain as this one seems to have stretched quite a bit.
