How to change boot priority without having + and – buttons

i am trying to install win7 from usb. in order to do that you know what i have to do already. but i don’t have + and – buttons on my laptop and that’s what required for moving them up and down. so is there anyway to do it with cmd prompt or can i just change the buttons setup for bios?
thanks
Answer #1
Remove two buttons and replace instead of + and –
After you finish job, just replace buttons again!
Answer #2
You tried U/D ? (Space bar to select)
Doesn’t it say in the BIOS which buttons to use ?
I’ve never heard of a laptop with no +/-
Answer #3
i don’t know how to remove buttons.
my laptop has + and – but they can be reached by pressing shift, they’re on the number like 3 and 4.
i also tried space and pg up and pg down.
Answer #4
my laptop has + and - but they can be reached by pressing shift, they're on the number like 3 and 4.
Press shift and press those buttons. Come on.
Answer #5
can you use the Fn key combo to “activate” number lock
or the lappy have a boot menu key (maybe F12) on the boot screen where you select your boot device
or can you get a keyboard to use for the install