There are a number of ways to activate the portal.
The easiest is with a flint and steel, crafted with one piece of flint and one iron ingot.
The second, and more tedious way, is to set up flamable objects (wool, wood, etc) that lead to the portal from lava and hope the fire spreads. This is how you activate the portal in situations where there is no flint and steel available, such as some adventure maps.
The third way is subject to chance, such as waiting for lightning to strike the portal, or while in the Nether, waiting for a ghast's fireball to activate it. (Be aware that a ghast's fireball can also DE-activate your portal from inside the Nether.)
Use a fire charge to light the portal
All you need is obsidion and flint and steel.Form the obsidion five blocks tall and four blocks wide.It should look like a rectangle.After that light the obsidion on fire and the nether portal will apear.If the portal does not show up then you did something wrong.
get a nether portal and use netherrack
If you can get a block next to the portal to light on fire somehow then the fire will go into the portal and light it. I'm sorry I couldn't tell you how to light the other block. I forgot how to do it.
You have to build a structure with obsidian and set the inside on fire with flint and steel. The structure cannot be made in your crafting table. You put obsidian in an upright 4x4 design, with the middle empty. Or if you have the portal gun mod first craft the portal gun then right click to fire portal and press g to switch between portals
Do you mean the nether.It's a lava dimension in minecraft.you make the portal like this then light it on fire with flint and steel. []=obsidian [][][][] _ _ [] [] O O [] [] | _ _| [] [] | | [][][][] / \
To go to the Nether in the pocket edition you will need to build something called a Nether Portal. Search google for how to build a nether portal. I am not allowed to add links on Answers.com, hope this helps though! Thanks for using Answers.com!
Build the portal exactly as you do in Survival mode. The portal is an obsidian frame measuring four blocks wide by five high. So there are six empty blocks within the frame. The portal will activate (or deactivate) when you set fire to its interior with Flint and Steel.
Using obsidian (The dark purple block [Created by having water hit a lava SPRING]) create a Frame Like this, where O is Obsidian, and A is air OOOO OAAO OAAO OOOO Then, using flint and steel, light fire to the inside of the frame, and it will light up and purple blocks will appear, stand inside the portal, and you will be taken to the nether.
It is not part of any crafting recipe, you use it to set fire to things. You could build a fireplace for example with Netherrack inside, and light those. Another common use is to open a Nether portal once the frame has been constructed.
Make a 4x5 obsidian frame, and set the middle of it on fire.
you cant