P.S is it ok to use some of the statments in my work, minius the author took keep enevery ones identity hidden!!!
There are various acceptable ways of acknowledging third party input to writings for publication, course work etc. In technical publications it is usual to place all sources and references at the end of the book or report. However, for what you are doing I prefer to see a short preamble attached to the main work - a simple sentence will do, i.e..
I would like to thank the members of -------- (in this case Derelict Places .co.uk) who have allowed me to quote their answers to my initial enquiry.
Where you actually quote replies, those words should be in quotation marks. I cannot see any reason why any member should object to this; after all they replied to a specific question, with specific reasoning behind it.
I base the above comments on having actually acted as an adjudicator - it also shows that you, as author, have actually put some thought and planning into your work.