|It appears many LW40 models are LW40-xxxx Express.|
Look on the stuck on label - what comes after LW40 ?
E.g.. on the LG Canada web site, when I search with "LW40 Express" there are no results - the only LW40 models found when I search with LW40 are these:
Product Support for LW40-J3MU1
Product Support for LW40-J3MF1
Product Support for LW40-S3MU1
The way you get into the bios is probably exactly the same as for your specific model, if your specific model is different. Look in the Owner's or User's manual if that's not found in other info.
Different brands of brand name system computers don't necessarily use, and often don't use, the same key to access the bios Setup.
Some laptops briefly display a line while booting that tells you what key you need to press to access the Bios or Setup.