Hi Simon,
I answered you incorrectly before. I "thought" I had previously wired it up to automatically use the site setting in the <mp:AddThisButton included in the layout.master of your skin:
<mp:AddThisButton ID="at1" runat="server"
AccountId=""
ButtonImageUrl="~/Data/SiteImages/addthisbookmarkbutton.gif"
Text="Share This Using Popular Bookmarking Services"
CustomBrand=""
CustomLogoUrl=""
CustomLogoBackgroundColor=""
/>
but I was mistaken, I must not have got to it, so you would have to enter it there manually on the AccountId by editing it in layout.master.
I have fixed it for the next release but because my AddThisButton lives in a separate project and has no knowledge of site settings, I had to make a new control in the mojoPortal.Web project that inherists from the AddThisButton but does know about site settings so it can automatcially hook up the account. So, in the next release I have changed it in the included skins to this new control:
<portal:mojoAddThisButton ID="at2" runat="server"
AccountId=""
ButtonImageUrl="~/Data/SiteImages/addthisbookmarkbutton.gif"
Text="Share This Using Popular Bookmarking Services"
CustomBrand=""
CustomLogoUrl=""
CustomLogoBackgroundColor=""
/>
The only difference is the <portal: prefix vs the <mp: prefix, but the <portal: version will automatically get the account id from site settings.
Hope it helps,
Joe