I really dont get how urns work, while you are skilling or killing demons they collect stuff, but how do you redeem it. I have seen something about teleporting them away, or using at ecto. How does that work? Thanks

There will be a teleport option once you fill the urn (fills automatically while in you're inventory), just press it and you'll gain xp. Or you can just bank it and use it later.

for the infernal ones, is it more exp by teleporting or using at ecto? Thanks

for the infernal ones, is it more exp by teleporting or using at ecto? Thanks

 

You only receive 1875 xp per urn teleporting away. I'd be willing to say it's more xp at the ecto.

With prayer urns, you can not get the ashes out of them. You can only teleport them away. None of the other urns collect real items and also can only be teleported away. If you want to get more xp then bank your ashes and ecto them or use them on a gilded altar.

http://www.tip.it/runescape/?page=crafting_guide.htm#urns

 

This is the Urns section of the crafting guide, it explains pretty much everything. I'm wondering if it is actually worth it?