How to install brother printer
Please download driver from https://support.brother.com/g/b/productsearch.aspx?c=us_ot&lang=en&content=dl for your printer
The install driver as you see on screenshots bellow:
Open installed printer, in this screenshot it is Brother QL810W.
Open Printer propteries and then Preferences
Setup paper size for your labels in printer (38mmx90mm).