In order to install a filter in Photoshop you will need to paste the file that contains the filter in the Plug-ins directory of Adobe Photoshop folder. Also, you need to know that the software must be closed when you "install" the plugins. If the Filter Forge comes with bundled filters, just copy and paste them in Plug-ins directory. If it doesn't have any bundled filter, you can use the main library provided by the developer to download and install the filters your want. Contact the support team for further information.