To replace the parts you need to right click on the part, then select delete minus which will delete the part but leave the traces. Then you need to save the sketch and delete the current parts from your mine parts bin, then shutdown and restart Fritxing to complete the deletion. You should then be able to reload the above parts drag them in to your saved sketch and place them. Then you need to click on each wire in turn and drag it to the appropriate pin to connect it. Then save your sketch again and all should be will.
