Hello,

I would like replacing this button by a small one (picture).
Is it possible ?

"is it possible?" is always the wrong question ;-) Two basic ways I would think of and both require some work and knowledge on your end:

• Extend the favoritesClass in your theme's functions.php or a custom plugin. Then override the original ad_removeButton()class method with your own in your child class.
• Use CSS via your theme to add an image in the background of the button which is not a but a.