You can view its assembly in the images below..
Crossbars:
1 nut
2 nuts
Screw the front and rear crossbars to the ends of the frame base. Use 4 M8x20 bolts and the 4 M8 washers; use the 5 mm hex key to tighten them.
Once the crossbars are securely bolted, cover the front and rear joints with the plastic covers.
How to install the pedals:
Remove the top cap by gently pressing both sides of the front joint.
Install the pedal, choosing which crank length you want and thread the pedals in at that length:
Handlebar installation:
Insert the handlebar post into the frame. You can adjust the handlebar height by raising or lowering the post; use the frame’s adjustment knob to lock it in position.
Next, insert the handlebar into the post’s guide. Use the clamp screw to secure the handlebar in the desired position.
Saddle installation:
Insert the seatpost into the frame. You can adjust the saddle height by raising or lowering the post; use the frame’s adjustment bolt to lock it in position.
You can also move the saddle forward or backward or change its tilt by loosening the bolt under the saddle.
Attention:The maximum tightening torque for the seat support is 5 Nn.