Hi Rebecca, my name is Neil, and I'm a Windows 10 user like you.
Sorry you're having trouble with your Microsoft Designer Compact Keyboard.
First of all, can you remove the batteries from the keyboard and leave it for 10 minutes. After removing the batteries, press a few of the keyboard keys to make sure no errant power remains.
Can you make sure that you are using the latest driver for your keyboard by downloading the Microsoft Mouse and Keyboard Center: https://support.microsoft.com/en-us/topic/mouse...
Put healthy batteries back in your keyboard.
Slide the switch on the bottom of your keyboard to turn it on. Your keyboard will automatically enter pairing mode and the LED light will flash. If it doesn't, press and hold the pair button on the top left of your keyboard for 5 seconds or until the LED light starts to flash.
On your PC, select "Connect" if a notification appears on-screen for your keyboard, then wait for it to get set up.
If you don't see the notification:
Select Start > Settings > Devices > Bluetooth & other devices > Add Bluetooth or other devices > Bluetooth > Microsoft Designer Compact Keyboard > Done.
If you are still unable to connect after this, let me know.
Kindest regards,
Neil