Using Custom Icons 
You can define custom icons for content items; for example, for items in the Launcher.
You are assigned the Content Admin role
In the portal, navigate to .
In the Portal Catalog, select the content item, and in the context menu choose .
In the Properties editor, choose Modify Properties.
In the All tab, specify a value for the Icon URI property, as follows:
Enter one of the following values:
Full path to icon; for example: http://...
Path that is relative to the application (which must be deployed on the portal), such as: /<application name>/images/<file>
PCD path in the Web Resource Repository (using the Copy ID option)
The following file formats are supported: GIF, PNG, and JPEG.
We recommend using icons sized 43x43 pixels for smartphones and 72x72 pixels for tablets.
Save your changes.