Your post(s) were caught by the moderation queue since you haven't confirmed your account yet, there should have been an autimatic email sent with the link to confirm the account, however it might have gone to your spam folder, so check there as well.
For the actual problem, it quite simple, the kinematic body node has no shape, it needs a collision shape node added to it, as the warning(hover mouse over the yellow icon next to the node name in scene tree) instructs add a child CollisionShape2D node to your KinematicBody2D node, then in the inspector give the newly added node an actual shape.
