Open up "oUF_D3Orbs.lua". Need to comment out 3 lines (I suggest against deleting them - this is quick and dirty, and if it breaks, you can just remove the --'s to make it work again). You can comment the line out by adding "--" to the front of the line.
Go down to line 1317, and comment it out (line copied here so you can double check it's the right one).
Code:
oUF:RegisterStyle("oUF_D3Orbs2_target", CreateTargetStyle)
Then, go down a few more lines - line numbers 1325 and 1326. Comment them out as well (again, copied here for verification).
Code:
oUF:SetActiveStyle("oUF_D3Orbs2_target")
oUF:Spawn("target","oUF_D3Orbs2_TargetFrame"):SetPoint(tabvalues.frame_positions[3].a1, tabvalues.frame_positions[3].af, tabvalues.frame_positions[3].a2, tabvalues.frame_positions[3].x, tabvalues.frame_positions[3].y)