Windows 10: No FN or F-Lock key on new MS Ergo Keyboard?

Just started using keyboard today and discover there's no F-Lock feature. Why? I have used Ctrl-F5 for years to force a hard browser refresh in multiple browsers. Not to mention many other functions. And with the removal of that single key and it's functionality, you've removed all those shortcuts. I've updated to the latest MS Mouse & Keyboard software and the option doesn't even exist to reassign to a key.How do you make a design choice to move forward from something as good as the 4000 keyboard and take huge steps backwards?

:)

 

Microsoft Ergonomic Keyboard, where is the FN or F-Lock? How would I F-Lock on this keyboard?

Thanks for respondind Dave. I do not have a F-Lock button above the backspace key. I purchased this keyboard for work, and I noticed it doesn't have an FN or F-Lock key. I was wondering is there was another method to lock the F-keys?

 

Microsoft Ergonomic Keyboard, where is the FN or F-Lock? How would I F-Lock on this keyboard?

Microsoft Ergonomic Keyboard, where is the FN or F-Lock? How would I F-Lock on this keyboard? I don't have those buttons.

 

Laptop FN Lock?

My boss has a Sony Vaio VGN-AR190G, it seems like FN lock is on, because when he types certain letters that have numbers when pushed with the function key, it types numbers instead of letters. I do not even see a function lock key on this keyboard. I'm not really sure what to do. I've tried googling the issue but haven't come up with a solution. There was a wireless keyboard plugged into the laptop for awhile, I checked that one for a FN lock key and it doesn't have one either.