Your macbook or macbook pro running a little sluggish? Got that RAM stick in your hand but need to know how to upgrade? No probs!

Follow the instructions and you should be fine. I’d highly recommend Crucial Memory finding the right RAM for your device here:
http://www.crucial.com/uk

Check out the written instructions below.

Removing or installing memory

Warning: The internal components of your MacBook can be warm. If you have been using your MacBook, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Before you begin

1. Shut down your MacBook. Disconnect the power adapter, Ethernet cable, and any other cords connected to the MacBook, to prevent damaging the computer.
2. Turn the computer over.
3. This MacBook model has an integrated battery that cannot be removed. Do not attempt to disconnect or remove the battery in the MacBook.

Step 2: Remove the bottom case

1. Remove the eight (8) screws that secure the bottom case of your MacBook, and then remove the bottom case.
2. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place.
   
3. When you remove the bottom case, you expose sensitive internal components. Avoid touching anything other than the memory assembly when you remove and replace memory.
4. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 3: Removing the original memory

1. Push the ejection levers on the sides of the memory module in an outward direction to release the module from the memory card slot.
2. The memory pops up at an angle. Before removing it, make sure you see the half-circle notches. If you don’t, try pressing the ejection levers outward again.
   
3. Hold the memory module by its notches, but do not touch the gold connectors. Remove it from the slot.

Step 4: Installing the new memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module.
4. Repeat to install an additional memory module in the top slot. Press down on the module to make sure it is level.
5. The memory modules should be parallel to each other. If it appears that one of the memory modules is not parallel, remove the modules and seat them again.
   

Step 5: Replace the bottom case

1. Replace the bottom case, making sure it sits flush. Grasp the case in the middle of each side, and push down first with one thumb and then the other to lock the snaps on the inside of the case.
   
2. When the bottom case is seated flush, replace and tighten the eight screws. Make sure the different length screws are in their proper locations.