There are no jumpers you can move around.
They are solder pads (which are real close to each other), and you need to apply a blob of solder to connect them.
If no solder is on them, then nothing has been set.
I don't know whether the shield assumes some default setting if no jumper has been set or not, you have to check that for yourself or just make the correct settings.
Read the manual.
Read the manual.
Read the manual.