First, pry off the outer yellow casing using the blue plastic prying tool provided in the kit.

Wedge the flat edge of the pry tool in the slit and use leverage to push the casing upwards and pop it off in multiple places across the top and side of the device.

This should reveal the inner workings of the tablet, be careful as the volume and power buttons may fall out in the process. The speaker will also still be attached to the case by wires as shown.