Self found solution: (to a problem that only exist on my special PSP X, I guess)
After drawing lines, look at the tool menue for pen. Notice the edit tool. use this to select lines. If you just try to click on a line and move it, a swigly line shows and the whole vector layer moves again. I assume this is the symbol for path, it thinks you want to move the entire vector path. You must use one of the next two methods.
1.(the correct way)
use the edit tool to select one line. If easily done click and drag a box arround the entire line. But if you have other lines that would also be in your box, or it is a curved line, do this: draw a box around the starting point of the line, notice the node is now highlighted black, now hold down the SHIFT key and draw a box around the end of the line. (this works because you are telling it to move all selected nodes, and the begining and end are the only nodes of that line, if there are any middle nodes you must highlight them in the same matter while holding down the SHIFT key) your line now moves on its own
2.(the much easier way)
Use the edit tool to add a node. with the same tool selcted, hold down the CTRL key, the word add shows, click anyware on a line (this adds a node, and also selects all nodes that are connected to that node) you can now easily move the single line