Unfortunately you can't edit them directly (they really should have and id and/or their own css class. The code for generating them can be found around line 456 under:
The other option is you could add code to the template file for your theme. For example the denim theme file you could change is
Text Formatted Code
{!if print_icon}<span class="some_css_class">{print_icon}</span>{!endif}
{!if edit_icon}<span class="some_css_class">{edit_icon}</span>{!endif}
An easy way to find out what template file you need to change is by enabling in the Geeklog Config "Template Comments in Output" under Theme->Advanced Settings. T