Tel":3thikyay said:
This is even more likely if you joined the ends using a chain tool rather than a special link. To rectify it, hopefully your chain tool has two pairs of 'teeth'
One pair is for joining the chain. This will have a plate that stops the chain flexing as you push the pin in. The other pair won't have this support. They are used for loosening a tight link. Just tweak it from the opposite side that you joined it from.
Sorry if that reads as jibberish or if you knew it all before hand!
Edit! You're sorted then! I didn't see the second page. Looks a cracking bike judging by the rear mech and wheel!