There is a push button at the bottom of the handle bar (by the basket). It's usually silver. I usually have to push with a screw driver or something on the button instead of just my thumb because it's a really hard to push(just be careful not to push too hard if you do then you have to fiddle with button up the tube to put it back in place). Once that is pushed in you have to pull the handle bar up. This is the instruction manual for the happy navigator but it should still be the same: http://www.kettlerusa.com/airnavigator.pdf (its on page 11) I provided a picture of where the button is.
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There is a push button at the bottom of the handle bar (by the basket). It's usually silver. I usually have to push with a screw driver or something on the button instead of just my thumb because it's a really hard to push(just be careful not to push too hard if you do then you have to fiddle with button up the tube to put it back in place). Once that is pushed in you have to pull the handle bar up. This is the instruction manual for the happy navigator but it should still be the same: http://www.kettlerusa.com/airnavigator.pdf (its on page 11) I provided a picture of where the button is.