Hi Fabrice,

This change is easy to make with the Professional Edition.  Of course, first of all, you'll need to copy the code for the button you want to use from the AddThis site.  I realize you've already done this, but for others reading this thread, you'll log into your AddThis account, select a button you want to create and copy the code for this button into your clipboard.

Then, back in DNN, from the actions menu in the metaPost module (which you can only see if you are logged in using a host level account), choose Administration.

In the administration screen, click the Manage Providers link.

In the list of providers, select the provider you want to edit and click the edit button

In the edit form, you'll want to add the script you copied into your clipboard between the beginning div tag and the ending div tag as shown below.  While this isn't necessary, the div tag included in the footer is used by WLW to remove the footer when entries are loaded back into Windows Live Writer.  The important part of the div to include is the first part which begins with <div class="d_itc_f".  Here is the full HTML for the div tag you can use:

<div class="d_itc_f" style="clear:both;height:11px;"></div>

Click the following image to see what the resulting HTML will look like for the footer.

I hope this helps and thanks for using metaPost!

Don