How do I add Tools to the tool shelf?

On my tool shelf in 3d mode I am missing the tool to let me add tools its gone. How do i add tools to it then because the button was never there in the first place:confused:

The option was removed a long, long time ago. it didn’t save added tools between blender sessions, so was pretty useless as a function. To add tools you’ll have top learn python scripting.

Oh thankyou