Mountain bike problem?

ransogg

New member
Ive just bought a 26" 18 speed mountain bike, its a beautiful bike but its got a problem.
While Im peddling everything seems fine (except for working out the gears LOL) but as soon as I stop peddling the chain drops seriously slack
and either derails or gets stuck between the tyre and the frame. Also if Im walking the bike the pedals turn instead of freewheeling. Can anyone help me???
 
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