A Google search for “galvanic skin response module arduino” yields about 26,000 hits.
To export the data you need a means of transfer and a program to receive, store and maybe analyze the data. Most all Arduinos have at least one serial port (the means of transfer). The receiving program can be as simple as the IDE serial monitor. Transfer the data to serial monitor, copy and paste to Excel or whatever. Then there are serial terminal programs that receive the data and write it to a file. More complicated would be to write your own receiving, storing and analyzing program with Pyton, Processing etc.
Or like ardy_guy said, save to SD, pull the card and plug into PC.