Keyboard won't link and screen is locked, I cant access Bluetooth settings

My screen says turn on my keyboard to make it discoverable.

Already have but still no change.

Already charged my keyboard overnight. Caps on light won't turn on when I press it after turning on keyboard.

Is something wrong with keyboard?

How do you log into your guest account

First make sure the batteries aren't dead and that the keyboard hasn't already been paired with another device. If it hasn't, the keyboard should pair automatically when you reboot. You may have to press and hold the power button on the right side of an Apple keyboard until the LED starts flashing.

Otherwise see these support articles:

Mac mini (Mid 2011 and later) and iMac (Late 2012): Bluetooth keyboard may not pair during Setup Assistant

Apple Wireless Keyboard: Difficulty during pairing process

If you have a third-party Bluetooth keyboard, you may need a wired keyboard to complete the pairing process. It's a good idea to keep a cheap wired keyboard and mouse or trackball as backups for a desktop Mac anyway, because Bluetooth isn't completely reliable.

You can gain access to your bluetooth setting by logging into your guest account, no keyboard required.

Thank you so much. I was looking everywhere for this answer but all I could find were people saying "you have to reboot". I had a video render going on on my account so rebooting was not an option. THANK YOU

To get past this get a cheap PC USB Keyboard.