Unknowndobo

So i think i'm making some progress, once in the lua sode screen i'm typing this. Lua> component.invoke("address of Redstone interface", getTarget(), port, data) and i'm getting a message attempt to call global 'getTarget' (a nil value)

So i'm completely useless at programming, HTML is about the limit of my abilities, i only started using Opencomputers because of a glitch in one of the other mods that has crippled part of my sky factory world. Whilst i'm sure it works amazingly for anyone with the skill to use it, i've just spent a couple of hours trying to work out something that i'm pretty sure one of you guys will do in seconds. Please bare in mind that i'm completely useless so if you wouldn't mind dropping instructions in as if i were just booting up the compute for the first time it would be appreciated, i've set up