I'm just about to finish Chrono Cross my first time on New Game+. I keep reading about the ability to import characters from previous playthroughs provided you took a certain path to recruit some characters over others. I read that you have to go to the Dimensional Vortex which is accessed via The Hydra Marshes in Home World. I go there and look everywhere but I don't remember how to get back to the vortex!

I read some walkthroughs but they don't tell me exactly how to get back to the vortex. They simply say to go to the marshes in Home World and re-enter the dimensional vortex. That's all nice...but where is it?

Can any of you tell me how and where I can get back to the vortex (which screen is it on and any hints to where it is), what items to use, etc.? Thank you.