Add-on doesn't show up in the Toolbar I am new to Blender, I've been playing around with it for about 2 weeks now, first time with a 3D software. I've done some tutorials and there are some where I have to go to user preferences and choose an add-on, the first time I did this, it was with the sapling add-on, worked fine, however today when I went to play around with it again, I checked the box, but the add-on settings that usually showed up on the tool bar on the left side of the screen isn't there. for any add-ons. I was really hoping someone could shed some light on why this is?
Enabled add-ons can be enabled permanently by saving the user settings.

Otherwise they are enabled only on the current session, but will not be loaded next time you open Blender.