So I recently just replaced my chain on my bike.?

Like I said, I recently just replaced the chain on my 09 Redlind 1.2. I bought a bell chain from Walmart and got the exact number of links, I assembled it and all and threw the extra links away. I started riding it and the chain is very very stiff. I need to find a way to loosen up the chain so it's easier to peddle. The rear tire is all the way against the frame so I can't push that forward anymore to loosen it.
 
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