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Since you're an active member you should be able to
If Quark is installed you will teleport to an enderman if you've aggroed one and are standing under a two block tall space, but it doesn't sound like what you're talking about
Direwolf has a spotlight on RFTools Dimensions that can essentially function as a tutorial.
Alternatively you can create some junk void dimensions and go look for those white structures, they spawn random dimlets. You do need flight though