How to delete a term base from MultiTerm 2011 Administrator

Hello all,

I'm currently working in MultiTerm 2011 Administrator to set up term bases for our clients. I have administrator rights with my profile but I can't permanently delete the test term bases I've created while I was training. The "remove..." button is in fact greyed out.

Does anyone know if it depends on the rights as administrator or am I missing something?

Thanks,

Sandra