I don't know the editing capabilities of the Mac or IPad versions, but you could simply open a signal for edit and, in the mesh-table, place the POSITION tag. The following will raise the item 2.5 meters vertically, with no horizontal movement:
mesh-table
{
default
{
mesh "blahblahblahblah.im"
auto-create 1
position 0,0,2.5
}
}