Hi there,
and Welcome here…
Ok So, is it a real Xiao from Seeed studio?
If so Is it a two board sandwich ? The bottom board is the Xiao and the top Board is the Mesh_radio. The buttons are tiny and check the WiKi for more info it’s all there.
Check this too… “1:40:00” Listen closely and do exactly this way… Success will be yours 
HTH
GL 
PJ 