Hi, there. my backup laptop is a

2019 HP Premium 15.6" HD Laptop, AMD A6 Dual-Core 2.6 GHz, 4GB|8GB|16GB RAM, 1TB|2TB HDD, 128GB|256GB|512GB|1TB SSD, WiFi Bluetooth HD Webcam 3-in-1

As you can see, it only has 4GB of RAM. Can another 4GB of RAM be added to this laptop, and if so, can it be a plugin kind (since I wouldn't dare open this up myself lol).

Thank you in advance!