I would like to change the buttons to my own but cant seam to find where to change the img source. in witch file do i find it?
Using your own button is easy. Just create the image and make it available online. Then put the <img> tag inside of the button you'd like to use, like this:
<a class="addthis_button_facebook"><img src="YOUR FACEBOOK BUTTON"></a>
Replace YOUR FACEBOOK BUTTON with the URL of the button you'd like to use with Facebook. You'll have to do this separately for every button you want to use.
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