How to get to bios on Lenovo ideacentre k430?

I tried f1, f2, f3, esc, delete. I want to access bios to make it start cd on boot.
is it possible my keyboard input isn't recognized on startup? Any suggestions would be great.

David O

Here is a section from the manual https://download.lenovo.com/...nglish.pdf
How can I start the BIOS setup utility?
To start the BIOS setup utility:
1. Shut down the computer.
2. Repeatedly press and release the F1 key after turning on the computer, then select Startup Boot Priority.

David