Hello! Thank you for the interest in NodeXL.
NodeXL can export network visualization images in various formats and resolutions.
Right-click the graph pane to display the context menu and select Image options to set the parameters for your image.
Right-click again to select Save Image As... to write the image to a file (JPG, PNG, EPS...).
It is also possible to right-click the graph pane and copy the image to the clip-board.
If the image is too small to see details like vertex labels, consider increasing the resolution of the image to a value like 4096x3072.