Alright, here's how it's supposed to be done:
1. you put all the mod files into the folder titled 'mod' - the qsp file and whatever folders came with the mod (usually a folder titled whatever the mod is named, I am unsure what comes with wlife, never used it)
2. you start the MAIN GAME. So, you click the 'Girl Life' qsp file to open it.
3. Once you started the game and loaded a save/picked your start, you go into the settings. There, you should find an option called 'mods'
View attachment 1441258
4. Usually, this folder is empty. So, you go to 'Install new mod'
View attachment 1441267
and then, this window should pop up:
View attachment 1441269
5. Once it does, you type in the name of the mod's qsp file (so, for whore life, you write wlife) and press OK. Unless there's something horribly wrong, it should properly run the mod.
I will say though, that I do not know if wlife works with 0.8.4 versions, as it was last updated with 0.8.3 versions and f95 lists it as abandoned. It might be that you'll get compability issues there.