You can download the plugin here. After download

1/ Log into your WordPress blog admin area:
 
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2/ Once logged in, click on “Plugins” at the left-hand menu (If you don’t have a “Plugins” option you will have to ask a blog administrator to do this and the following steps):
 
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3/ Click on “Add New” button at the top middle of the page:
 
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4/ Click on “Upload Plugin” button next to “Add Plugins”:
 
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5/ On the next page you will be asked to “Choose File”
– Click on this button and select the DW-notifications.zip you have downloaded from DesignWall, once you have selected the file,Click “Install Now”:
 
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6/ After finishing the install, click on “Activate Plugin”.