You cannot create more joints in Toribash.
If you want to create OBJECTS, then press * of your Numpad. Also, press H when you've loaded Worlbuilder for more help/informations.
use the search function and find it. The tutorials are better then any of use can explain it in words.
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From a looong time ago:
[21:56]<Blam>ManBreakfast: Frunk wants to know why you banned him from IRC
[21:56]<ManBreakfast>oh, fuck
[21:56]=-=Mode #toribash -b Frunk!*Frankie'sip by ManBreakfast