I have widget locker but I don't see this unlocking slider in my options, how do you add sliders?
First you need custom sliders. Ton of them
here.When you get the files put them in the data folder on the SD, inside there is a folder com.teslacoil.widgetlocker, inside of that a themes folder. Don't extract the files or anything, just put them them the way they are inside that themes folder.
Then open WL from the app drawer. Key is to know you can't edit the lockscreen while the phone is locked, you need to unlock it and open the app from the app drawer. Editing is easy; if you wanna remove a slider you need to long press the space between the two slider options and drag it to the bin. Adding is easy, long press on the screen and add custom slider or widget or anything. Everything should be straightforward from then.