I successfully changed the prereqs for another tech, not the slightest problem.
Looks like the problems comes from the fact that I simply added the technology.
Set the X and Y value to 0 (or negative), so the tech will appear in an area in the tech tree, which you can't see (left or above it).
It'll still show up in the civilopedia .
You can not really "add" the arrows.
The are automatically generated between the tech and what you set as OrPreReqs.
AndPreReqs are shown as button in the new technology at the right, like in your example -> change the AndPreReq tech to an OrPreReq tech and you should be fine.
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