Here is quickest way of showing an ad in bottom right corner of your WordPress site simply with an image URL, no other settings to make or set. Pop-up Ads Bottom Right Corner allows you to display add with an image URL and the advertisements pops-up in a windows vista type dialog box and your users may close that by clicking the ‘X’ button.
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To start, install and activate Pop-up Ads Bottom Right Corner plugin then visit your admin area Dashboard -> Settings -> Pop-up Ads Bottom Right Corner page and add your image URL, save changes and you are done.