does my chromebook have write screw I can take out?

Looking at the images for your computer and a few online guides, I do not believe that your Lenovo N23 Chromebook has a write screw

Alternatively, if you just want a base storage upgrade, you could put an SD Card into the SD card slot on your computer in order to store files. You can buy a 128 GB SD Card on Amazon for pretty cheap: https://www.amazon.com/SanDisk-128GB-Ult...

It seems like the RAM in your Chromebook is soldered, rendering that unable to be upgraded.

If you want to be able to run more applications then you may be able to install a Linux distribution like Ubuntu, or install Windows 10. A google search should give you the guides needed for this.