Trouble with Dimension Tutorial

I feft-click click on the left side of a rectangle, the I left-click on the right side - the dimension appears directly on top of the rectangle, but the software does not allow me to move the dimension above the rectangle. Any help on this?

Activate Free Snap.

Or you may have activated Restrict Horizontal accidentally.
See http://forum.librecad.org/how-to-calculate-a-surface-tp5716879p5716882.html

I did not find the free snap button on my version of the software - not at the bottom, not any where. I am having trouble inserting image, I have file for you but it wants me to send an http:\.  I don't understand this system!

What version and what OS do you use?
The snap buttons should be at the bottom left out of the box.

If they are switched off accidentally you can activate them with Widgets - Toolbars - Snap - Selection.

To upload an image select it here in the forum with Insert Image -  Upload image from my computer - Select