Apparently you can't. Thanks to the U.S. Digital Millenium act or whatever, almost all subbed episodes of 5d's (God knows why) have been removed/blocked/deleted. You might try just googling whatever episode in particular u want to watch, then just keep clicking search results until you find what you need.
Edit: Try animecrazy.net. I found the episode I was driving myself nuts trying to find in eng subs (the americans are pansies, they took out all the good stuff in the dubs)
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You can find Pokemon episodes at "pokemonepisode.org". but not all of them are in English.
It is not yet dubbed, and may never be unless someone writes a strongly worded letter to VORTEXX and requests specifically to have episodes 156-180 aired in English.
probably
You can find a YuGiOh cards guide online at the YuGiOh Card Guide website. Once on the website, you can view cards for all the different decks and communicate with other YuGiOh fans on the forums.
You can find Yugioh cards in many stores Here are some stores that will have them- Wal-Mart TargetSams Club Possibly a trading card came store and Possibly a comic book store