Fetish modification

[Mandy0877]

A friend told me that I might be able to modifie Fedish windows with some of the other Modifcations made to single window pieces. I don't care for the Market window much and would like to trade it out for one of the other ones that I can download here. Could someone please tell me how I could go about making these changes please? Oh and I'm less than 45% computer literate so use small words please.