Hey, it is an amazing app but I am having troubles with F-7. (Full screen wallpaper for lockscreen)

I made my wallpaper to the correct dimensions. Copied it to '.wallpaper' and named it "mywall1" Then I set it onto my phone through

Settings->Wallpaper

I opened the QT app, pressed F, pressed 7, and then pressed 1 and it said that it was successful. I didn't reboot my phone (like it says) and locked my phone.

In conclusion, it didnt work. Any help please?