Creating a portal

1. Build the frame with any blocks and any shape (round, diamond…).
2. Stand inside it (or look at it) and run /rp crear <id> [destination] — e.g. /rp crear gens gens sends players to the gens server.
3. Fill it and fine-tune it in /rp.

It also works by looking at a lit Nether portal, water or lava, with the wand (/rp varita) or with your WorldEdit selection.