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...snip..Then I select with "alpha to selection" and select "move" tool but there is no properties of selection.
"Alpha to selection" only creates a selected area, not the contents of the area. You need to follow up with a "Edit -> Copy" to put the pixels into the Gimp clipboard.
Then as Ofnuts posted several ways to Edit -> Paste and move that to a precise location.
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I also tried select and SHIFT+CTRL+L then I can move the square with arrow keys but there is no way to set the position by entering the exact numbers either.
You can use this old python plugin (searching probably will not find it) that allows paste-ing at a precise position.
see: attached zip file.
unzip and put pastxy.py in your Gimp profile C:\Users\.gimp-2.8\plug-ins
A couple of screenshots.
The menu entry:
https://i.imgur.com/4HJfEB7.jpgThe plugin dialogue:
https://i.imgur.com/ziQhkdJ.jpg