In terms of choosing the right memory, has a convenient tool for recommending memory that is compatible with your specific system. If your system has 2x 2GB sticks and no open slots, then you would need to buy 2x 4GB sticks instead and remove the existing modules. If your system's 4GB of memory comes from a single 4GB module and you have another memory slot that's open, then you could just buy another 4GB module and add it. However, you should check to see what you currently have in terms of available slots in your system. But once you find that, one of those documents will have step-by-step guides for how to remove and install each component of the system, complete with diagrams. The "Desktop-元E8E1" name you provided is just your Windows computer name, not your laptop model. If you want to add memory, go to, search your laptop model name (or Service Tag), select the Manuals & Documents section, and download the Owner's Manual or Service Manual. So even if you DON'T see a lot of memory being actively used, Windows can find ways to take advantage of additional memory if you provide it. 8.1GB of that shows as "In use", but an additional 7.6GB is being used for standby. As an example, on my system I have 16GB of memory. On Windows 10, this is shown under Task Manager when you click the Memory tab as "Standby memory". If something else needs it, then memory used for those types of optimizations will be returned, but if you end up launching that application, then obviously that will happen faster if it's been preloaded into memory. For example, if it notices that you tend to use a particular application frequently, it will preload that into memory even when you haven't launched it as long as nothing else is using that memory. And if more memory is available and nothing else needs it, Windows will start using other optimizations.
Windows generally won't allow ALL of the system memory to be used because it will try to keep some available for new applications in use, etc, so you shouldn't wait to see extremely high utilization before deciding to add more memory. If it's using more than half, then adding more memory will likely improve performance. Open Task Manager, click "More details" in the lower-left corner (if it already says "Less details", skip this), then go to the Performance tab and see how much memory your system is using during your normal workloads.
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