Editing
There are several ways to do this. First, set the text box (let's call it text0) as me.text0.enabled=false in the properties setting of the text box. If you want them to be able to edit it by double clicking on the text box text0 simply put in the Double Click property me.text0.enabled=true. Also, in the After Update field use me.text0.enabled=false.
If you truly want them to have to double click on a label then simply place another unbound text box on the form with your caption in the data property of the text box such as data: ="My label". Set the locked property to yes and under format use the flat format instead of sunken. In other words, make it look like a label. Then, in the double click property set it to me.text0.enabled=true.
Hope this helps