SSD M.2 Slot

To get this information you need to log on to  Dell Support, enter your model number, and most importantly Enter your Service Tag Number. 

That will open all the hardware information on your Particular notebook, You should download and read your Service Manual there you will find out how to open your notebook

The storage section will show you what slots you have and what will work in them. and what you current storage is.

@Jester99 

How to upgrade Dell inspiron 3576 Intel core i7 8th Gen ssd m.2 256GB to hard drive 2TB:

https://www.youtube.com/watch?v=1H3eGZI61yw

Best regards,

U2