Hi @WigglyCake
Welcome to the forum. Just to confirm that what you are trying to do is transpose the melody up or down an octave. If this is correct you can do this on the EDIT page where you can transpose individual blocks or a whole pattern.
There is a tutorial on this: Transposing Patterns (aka Changing Key) for the PC and MAC versions. I am not sure if this is applicable to the iPad version as I don’t use it, but I assume that there is something equivalent on this version.
Hope this helps