hello,
the only memory slot you can reach is under the laptop

in the old days they used to put them under the key board but not any more.
you got to return the memory
and the way they would do it in the pc_clinic at PCWORLD would be to try double the size in same slot
and if it does not boot they will take it out put old one in and boot up and will not charge any thing for labour.as it would not be compatible.
Ben