How can I uninstall Yosemite on a USB drive?

I have a 2009 Macbook running Snow Leopard 10.6.8. I have found that various websites, especially ones with Flash, keep telling me my software is out of date and I have trouble playing videos. So I thought I should maybe upgrade to Yosemite, but I wanted to try it first. Several websites suggested I could install Yosemite on a 32 Gb USB drive as a triel and so retain my existing OS, switching between the two on startup by pressing the option key.
So I did it, was able to run Yosemite (slowly) from the USB drive, but when I tried to restart using the Option key, the Hard Disk option was labelled "Installer" and selecting it only started the installation process over again.
It appears that the Hard Disk is still intact, but I can't get back to my old OS. If I remove the USB drive before startup, absolutely nothing happens. It seems that the software or firmware that boots up has been reset and I need to know how to set it back again if that is possible.
I'm pretty desperate. I need to get back to Snow leopard and do a few things before I make a final decision on Yosemite. Can anyone help me please?

If you are currently on Yosemite have you gone into System Preferences and clicked the StartUp Disk option, this should give you a list of available disks that
can be booted to. Hopefully this will get you back to SL.

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