Hey Connie,
The site I linked you to says your laptop supports up to 8GB of ram, it also links you to a 4GB memory module available for purchase from 3 different vendors.
You should only add memory if you currently have only 4GB installed. Here is how you can check to see how much memory you have installed.
If your laptop is using a Hard Disk Drive and not an SSD, then upgrading to an SSD would be another option.
Here is a relatively cheap 512GB SSD
Here is a USB to SATA cable that would allow you to clone your existing Operating system to the SSD
If you go this route you can use Macrium Reflect to clone your disk.
Alternative ways to speed up your computer recommend by Komando.com