Need Help Getting GRUB2 to be the Default Bootloader

[BoDyBaG2224]

Hello all, I have Windows 7 on one SSD and I have Ubuntu on a seperate SSD. Currently I just mash F11 to get to the UEFI boot config screen from the ASrock Splash screen and then choose to boot from the Win 7 SSD or Ubuntu. I have no idea how to get GRUB2 to be the default bootloader. I imagine that I would have to set the first boot device to be the SSD with Ubuntu on it and then somehow change the mbr to point to GRUB2, but I don't know how to do that.

 

Also what complications would this cause if I was to remove Ubuntu at somepoint (I've read that you will need to repair Windows in that case)? I basically just want to have a screen prompting me which OS I want to boot into with the option to timeout to a default OS, GRUB2 I know can do this, but I can't get the damn things set up lol.