To begin configuration, you must first enable
P4S features for each
SharePoint farm and site collection where users should be allowed to work with mashups and apps. See
Enabling
P4S
Features in Farms and
Enabling
P4S
Web Parts for Site Collections.
You can also choose to manually enable
P4S features for individual sites that are not Mashup Sites. See
Manually Enabling
P4S
Features for a Site.