Just stick a pencil or two down in one end and prop the dome up with that. when I used the domes years ago, I'd just raise an end up with something like that.
I just lay a sheet of clear plastic wrap over the top of my containers....VERY loosely and as soon as the seedlings start popping up, remove the whole thing. I've found that they do much better without any covering at all after that, and haven't done anything else for years.
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