Relative coordinates

Hi,
I'm a newbie and I do not find how to encode relative coordinates when I have to displace some objects from one place to another place.
Is there someone that can explain to me how to proceed?
Thank you very much.

The answer is so simple.
The coordinates should be given on the command line with an @ :
@X,Y

I read this in an old documentation of QCAD in PDF format.

Unfortunately, the help is not accessible in my installation under WINDOWS XP version 1.0.0Rc1

Please, update your installation of LibreCAD to RC2
http://librecad.org/cms/home/installation/windows.html
In RC2 the menu "Help->Manual" works