Rain meter task bar Help

[iamsurreal]

im using the skin black aps
http://askblaster.deviantart.com/art/Black-Apps-for-Rainmeter-274284115

and im wanting to change the icons within the programs listed in applications panel. i know how to edit it and write the directories towards my program but im confused on how to change the icons to fit the program im choosing.

help me !!