keyboard removal

I'm trying to upgrade memory on a E system laptop2513.I believe 2nd memory slot is under key board but I'm unable to locate the screw that secures keyboard from .the back Help please

I don't know the specifics of your laptop. In general most keyboards are not secured by a screw from the underside but some are. Where they are, the retaining screw is generally at around the position of the centre of the keyboard.

Lots of confusion over these
IS it E-Systems or Ei-System?
One is a Dixons / DSG ?PCWorld trade name, selling rebranded generic machines from Taiwan
The otheh was a subsidiary of Gateway - now part of Acer - and sells Acer rebrands

I can't track down any online info about this machine as an E- or Ei- machine
Any info will either be on Gateway/Acers site - but I can't find it under this name, we need to know the Acer or Gateway equivalent model. OR its hidden somewhere on the DSG site - but since the recent redesign, all the tech info there is hidden.
The alternative is to find out who actually makes it. I can't find any cross reference to ID that.
There might just be some indicators on the makers plate on the machine. Are there any other "model numbers" listed there other than "2513"?

Some keyboards are not held by screws from the back, but by little clips around the keyboard. Typically they will be above F1, F5, F11 and num Lock. Try running a small screwdriver along the gap between the keyboard and the surround and see if you feel any resistance, or "bumps". If so, that may be a clip. Push it away from the keyboard, it is a spring loaded bit of plastic, you can then lift that area of keyboard. Move along the top, and release the other catches. If you still feel resistance, there may be a screw as well. DONT FORCE IT, you will break the keyboard.