How do i get more tension on my bike pedals?

Matt

New member
My bike was working fine and then one day the chain just started coming off the sprocket. i've moved my back tire back until it was tight again but then i started to lose tension in my pedals. it has been like that for a whiloe and it is really starting to bother me. I've checked my bearings multiple times and did not get any results. I have just a basic mongoose trick bike. Anyone who has a good way to fix it tell me.
 
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