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How to download Windows on Linux Mint

So some time ago I bought a very old Mac which had OS X 7 (I believe, might be wrong) running, and instead, I chose to download Linux Mint on that particular Mac.

Recently, I need Windows to be downloaded on the Mac (I don’t mind deleting the data present on the Mint OS). However, in order to actually load the live USB that contains the Windows USB, I need to enter into BIOS, however, during startup, none of the Key Combinations seems to let me into BIOS. Is there any other way to install Windows over Linux Mint, or is there any way to enter BIOS?

Thank you!