Problem with installing on external USB

[Sync100]

Hello,
I have an HP notebook with Windows 7 installed on the internal hd and I am trying to install Ubuntu on an external USB HD. I am using the iso on CD. The image gets loaded but GRUB is not installed in the right place, I think. I changed the BIOS settings to have it boot off the USB HD before the internal HD. But it always by passes and goes right to Windows. I have it booted into the temporary session (from the Try Ubuntu option). and can see the filesystem. How do I get grub to the right place?

Thanks,

[C.S.Cameron]

Welcome to the Forums.

If doing a full install, when you get to partitioning use "Something else", (Manual Partitioning).
You will be given a choice, via drop down, where to install the boot loader.