Welcome to Linux Questions !
If you did not find this
(customize icons eee) then look here
I guess, it is possible to create a new small
icon with a slightly different name, and when
you are sure it works, remove the big one.
Password Dragon : first find a way to open a
terminal window. Then please do command :
'cd passworddragon/' and next :
'java -jar passworddragon.jar'
Of course the Java runtime is to be installed
before any "Java commands" will work.
Later, you can create a script and an "Icon"
to start up Password Dragon.