Selecting menu options

Hi,
I have a BB Bold 9700, running OS v5.0.0.593. This is an old work one and has been sat in the back of a drawer for a few years as the trackpad no longer works. The BB was replaced as the company IT no longer support it, and it never got returned.
Anyway I dug it out as a replacement for my Curve 8320 as that got very wet while out running one day - still not dried out a month later. So I have run a security wipe and I need to get BBM working again. This means I need to accept the user agreement.
I can scroll through the blurb but I can't toggle between the I Accept and I don't accept, this means the only option I can choose is the I don't accept - which is a bit rubbish.
Is there a key shortcut which allows me to toggle the options? I can live without the trackpad, my wife won't let me live without bbm.
Any suggestions
Thank you
Nick
I have posted this on the OS5 forum as well.