Then, fallback to plan B, as everything You need to know was here (in fact, even in few first posts, another ones are just to make it easier for end-user).

No irony here again - it's just that lack of understanding basic concepts could bring great harm to Your device. Methods described here consists of editing rcS-late (critical file for booting system) or putting script in event.d (scripts executed at boot time) - doing both without any idea of what You're doing could make Your system unbootable.

/Estel