Below the seat is a bracket on the neck of frame. There should be a lever that you pull and turn counter clockwise to loosen. Then you can raise and lower seat.
I've attached link to mongoose. By all their pics, ALL of their bikes have adjustment where neck comes out of frame ->http://www.mongoose.com/usa/usaeng/bmx/P...I've attached link to mongoose. By all their pics, ALL of their bikes have adjustment where neck comes out of frame ->http://www.mongoose.com/usa/usaeng/bmx/Products/BMX/All/?filterYear=2011
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Below the seat is a bracket on the neck of frame. There should be a lever that you pull and turn counter clockwise to loosen. Then you can raise and lower seat.
I've attached link to mongoose. By all their pics, ALL of their bikes have adjustment where neck comes out of frame ->http://www.mongoose.com/usa/usaeng/bmx/P...