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Should be much the same as with any bike. Loosen the bolt (probably metric allen wrench head) that is on the clamp at the top of the seat post, raise or lower the seat, and then retighten. If you want to move the saddle forward or back or tilt it differently you loosen the nut or nuts on either side of the saddle, move as desired, and then retighten.
ONE AT A TIME, loosen the nuts securing the training wheels to the rear axle and slide each one upward a little bit so it float a little bit off the ground when the bike is vertical, then retighten the nut.
As she develops her handling and balance skills she'll need less help from the training wheel. So you can gradually raise them a bit higher as she masters balance and then she'll develop the 'lean' for turning. Ultimately, you remove them entirely.
I have a feeling it is made for old style bikes, not these new fangled things. The seat post clamp is the bolt , nut or quick release that holds the seat in the tube and stops it from going up, down or spinning. In the case of the new bike, it could be way down low, where it won't do you any good. I would suggest a clamp of some sort up top to make the child's seat sit level. Depending on how the child's seat is fastened on, you will have to make something work. Like a pipe clamp, antennae clamp, muffler clamp, something like that to replace the seat clamp. But iof you seat clamp is level or up high, remove the nut and bolt and see what happens with the child's seat clamp. Hope this helps.
Stem length is the only dimension that can be modified, assuming the bike is not TOO long. They don't adjust in that direction but a Bike Shop can work with you to select one with a shorter reach and/or a different rise if necessary.
If your son has any desire to ride faster than 15mph or so for prolonged periods he's going to have to get his torso down and out of the wind, so a leaning forward postion would serve that goal.
To adjust the seat for height, there is a locking bolt on the seat post, below the seat. Loosen this and the seat should drop down the hole. Lift it up to your specified height and tighten up the bolt. You can also use this method to adjust the direction of the seat in relation to the handlebars, left or right.
If you need the seat adjusted for its angle. Under the seat itself are two bolts clamping two large circular bits of metal, undo these bolts and tilt the seat downwards or upwards, retighten when you have it just right.
1. Tighten the bolt on the seat-post of your bike's seat if your seat is a bit shaky. You may need to replace this bolt if it is rusted or withered.
2. Adjust the pitch angle of your seat if it is uncomfortable. You can have it level, leaning forward or leaning backward depending upon what is more comfortable for you. Use an Allen wrench (Allen key) to loosen the bolt on the-seat post to adjust the angle.
4. Tighten the tension on the cover of the seat if the seat has one and it is loose. If it has 2 straps underneath the seat attached with a hook, release it from the hook and tighten, then re-hook the straps.
By "giving out" do you mean it feels like not all the power generated by your legs is getting to the rear wheel? This can be caused by a chain that need oiling, pedals that stick or don't turn easily, badly adjusted gear set (that doesn't have the chain riding in the middle of each gear, but off to one side or the other). Do you notice any chattering or scraping noises when you ride? Also, make sure your seat is adjusted correctly. To get full power, you leg should be almost straight when you are sitting on the bike and the pedal is at the bottom of the stroke. If not, raise the seat until you can just touch the pavement when the bike is tilted (as at a stoplight). Also, make sure the tires are inflated correctly. Overly soft tires take more work to get to your destination.