If you are replacing the old with the new one, look at the RAM slots in your desktop. You can notice little tabs on the sides of the memory. Push the sides down allowing the memory to pop up and come loose. Take out the old RAM from the machine and insert the new memory in the place where the previous one was. Push down on every side and notice that the tabs rise up. Get it in place with the tabs clicked and you can see that the tabs are in the small groove holes of the sides of the memory.