I agree, while Fritzing is a lot easier to use that the other EDA programs it is still fairly complex. I think the most likely problem you are having is selection (correct me if I am wrong here). In order to change the position of something you must have it selected which isn’t always the easiest thing to do (because Fritzing sometimes selects something other than what you expect). Assuming you want to change U49 (the end sensor), first you need to select it so Inspector recognizes it. Here is an image with U41 (off screen) selected and thus U49 not selected:
U49 looks just like U48 next to it and Inspector says “U41” to indicate U41 is selected. To select U49 you need to click on it til it looks like this and comes up in Inspector as U49:
Notice the dashed line around U49, that is the selected indication (It could also select one of the traces nearby, in which case that would have the dotted line around it), as well Inspector now shows U49 is selected. At this point you can either type numbers over the X and y coordinate values, or use the up and down arrow beside the numbers to increment them and thus move the part. You likely only want to move in X (horizontally) so you want the left most box in location.
Peter