Hi dadim, and welcome to Slackel. A common way to change a wallpaper permanently (when setting up Openbox from scratch) is to use nitrogen. However there is no need to do that on Slackel, since the default file manager, pcmanfm, can also take care of it. By default, your ./config/openbox/autostart.sh should contain a (not commented) line:
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([ -x /usr/bin/pcmanfm ] && dbus-launch pcmanfm --desktop) &
which does loads the wallpaper every time you start Openbox. So you set the wallpaper once (via menu Settings, as djemos suggested) and you are done.
Also, don't be surprised with Slackel running smoothly in an old netbook (which would be useless otherwise). One of my Slackel installations is in an old netbook as well, and it works just fine. Slackel is lightweight without sacrificing functionality.