I'm still not very clear about what you are asking.
Please tell me whether you are seeing folder managing panel that has 4 tabs (Browser, Last50, Groups, Alias)in the left hand side of your TS 2.1 or not?. If not, there will be small arrow buttons that can be used to activate/deactivate that panel. You might have accidently deactivated that panel. Click one of those buttons to activate the panel. Once activated click "Browser" tab to make it active. Then right click and choose "Add new data dir". Now you can add your data drive info (like
Hope this helps.