USB-debugging mode in Blackberry Storm 9500

Hi guys, hope there's someone who knows the solution to this.
I have an old Storm lying around with the first text messages between me and my gf. I would like to transfer these messages to my Mac in text.
Downloaded the software from dr.fone, but now it says I need to enable USB Debugging. But no matter where I look in the Options menu, I can't seem to find it.
Here's what the About screen says:
Blackberry 9500
v5.0.0.841 (Bundle 1413, Platform 4.2.0.380)

Anybody got any idea?