Probably.
You can add/change RAM in just about any laptop
Assuming the RAM in yours is user-replaceable, most laptops have 2 slots for the RAM. For your existing RAM, your laptop will likely either have 2 x 4gb sticks, meaning both slots are populated, or 1 x 8gb, meaning there's a free slot.
If there's a free slot, you can just add another 8gb stick - though make sure the frequencies and timings are the same. If both slots are occupied (2 x 4gb) then you can just remove the 2 sticks and add 2 x 8gb stick in their place.
If you download and run
CPU-Z and look at the
SPD tab, it will tell you what RAM you have in what slots. You can upload screenshots of what it says for Slot 1 and Slot 2 to Imgur and post a link here if you need help understanding what it all means.
2 things to bear in mind:
1) are you really going to get any benefit from more RAM? Depends on your laptop spec and exactly how you use it
2) If it's under warranty, does the manufacturer allow you to open it to add RAM?