read the INSTALL files
with all due respect, do you read anything related to the files/stuff you have questions about before you beg for answers/someone to explain how to do it for you?
The main focus of this site is to help people solve problems with code that they wrote, and have problems with. Not explain in detail how to install something that the original author most likely WROTE or provided documents on, and most people (if any) have never even seen before.
So far you have asked about adding Forums to your site
how to get some chat code working... (Which was actually relevant to this site.... you had code that was broken, that everyone could look at and help you resolve the errors you mentioned)
you've asked how to add contact forms to your page... which is a very basic feature of any site and could easily be found on google or by searching the forums here I'm sure....
how do you know if you have MySQL installed....
how to tell if you have PHP installed....
how to open the PHP install you downloaded....
and out of those questions you posted 1 of them in 3 different forums, and 1 of them in 2 different forums....
you still dont appear to have read the Newbie forums Sticky threads.... regarding Ettiquete and forum policies/rules... much less the link that Dalecosp posted here...
nor have you shown any attempt at learning/figuring something out on your own, you just jump straight to the forums and post a question, usually ill formed and in the wrong forum....
Sorry if this sounds harsh, but we are all volunteering our time to help out, but you have to do your part too. Show us you are capable of helping yourself to an extent, and more people will be likely to attempt to help you... Put forth the effort to provide an attempt at coding that we can look at and point out mistakes on, dont just ask us for code, or ask us to fix it.. If you rely too much on people from here to do everything for you, eventually nobody will even read your posts.....
good luck, hopefully you take these suggestions to heart and actually follow through with some of them, then take and apply them to your future posts/programming attempts