can someone pls ?

i need help on how to set up my esc run in series..im new to electrics..i actually posted on the wrong thread about this but i will ask again..
im also curious what caused my esc to burn..i got it used and i connected it as seen on the pix..less than 10sec i heard it sizzle..are my connections right?and do u think it messed up the esc when i used a y-harness to connect it to the rx with the brake servo?