If you need us to install your application correctly you can purchase an install. I can not go into your server and install the application for you unless you do that.
From a support perspective I can tell you what your issue is and how to correct it. As long as you fill out the proper database information in the config file that error will go away. That requires though that you enter all the correct information as in database host,name,username and password for both the photopost and forum databases. Where to enter things are clearly marked in our config file.