Well I don't think invisionfree allows you to install your own forum. but if you mean installing your Invision Power Board (which invision free uses), I can help. Its pretty simple, just upload all the files, and then install mysql, next go to the install file where you input the information. But you can't get any invision power board forum anymore for free. they now require lisense (2.0 and above) 1.3 and below are free, but i can't find the link