A:AnswerHi Kevin,
You can actually do both! You can order online or purchase in store! If you ever need assistance, please contact Logitech support on the web. LaShonda from Logitech
A:AnswerDon't use cherry key caps with this keyboard. Because the switches on this keyboard are north-facing, they will have interference with cherry keycaps. I'm using OEM keycaps with this keyboard and don't have any problems.
A:AnswerHello Daisy66, Unfortunately, the K845 doesn't have a function key lock. For FN Key shortcuts, here's a link to the product support page for the K845 which goes over them: https://support.logi.com/hc/en-us/articles/360026246653-FAQs-K845-Mechanical-Illuminated.