STEP ONE
Edit Bosses.lua and change the name of the nearest capital at the top of the
file.  The list of corresponding "monsters" is a few lines down, for reference.


STEP TWO
Put something like this in your addon code:

  for i, v in ipairs(DBM.AddOns) do
    if v.modId == "DBM-NotScaryAtAll" then
      DBM:LoadMod(v)
      break
    end
  end
  local mod = DBM:GetModByName("NotScaryAtAll")
  if mod then
    mod:EnableMod()
    print("Now tracking ID",mod.creatureId)
  else print("Can do nothing; DBM testing mod wasn't loaded.") end


STEP THREE
Engage the "monster" in combat.  Give DBM a few seconds to register the start
of combat; if you one-shot the level 7 critter with your 90k fireball crit,
nothing useful will be done.


STEP FOUR
Hopefully you remembered to also register a "kill" callback with DBM....
