How do flashbacks work?

I've never done a flashback (villain side specific here) and I saw someone mention somewhere else on the board that they'd just do flash back missions when they get to level 25 to earn some merits to get some IO's they wanted. I've been reading through the Wiki about it (http://cityofheroes.wikia.com/wiki/Flashback) and I see that'd I would have to go to someplace called Ouroborrus (never been there) through the use of a temporary power that makes a portal.

I'm a little confused on how exactly to get this temp power (let alone at level 25) as looking at the wiki that talks about the needing to get the Entrusted with the Secret badge, which seems like quite the chore for a level 25 character to do. Is there a relatively easy way for a level 25 character to get the portal without having to defeat one (or more) of the signature heroes in Recluses Victory?

You should have kept reading on the Wiki, then you might have been Entrusted with the Secret.

Also, use the site I linked to, NOT Wikia. Wikia is old, outdated, AND filled with spammers.

The easiest way to get Entrusted With the Secret redside is to do Marshal Brass' second arc "Echo Down the Aeons". It's 3 missions and you can do it long before you ever hit level 25 (bear in mind, you won't be able to use the portal until you hit 25, but once you get there you'll be able to use it immediately).

Failing that, when you get to level 25 find someone to open a portal for you (asking in BRoadcast/Local at the Cap market usually works). Enter it, then get to the top of the spire somehow (fly/SJ/TP, otherwise you can very carefully walk up the thin pole leading up to it).

After level 25 you can use a portal that someone else opens to get into the zone. There is a badge in there that grants you your own portal.

Usually if you ask in broadcast someone will be willing to open an O Portal for you to use. It recharges pretty fast, so it's not asking a whole lot of someone.

thanks for all the responses...much appreciated.