1. You can't make one from scratch 2. You can find one in a stronghold. You need to put ender eyes in the outside of the portal slots.
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In Minecraft you must find a stronghold that holds an end portal. You will also need 9 ender eyes to activate the portal. Ener pearls drop form Enderman and you can craft the ender eyes from them.
Get some ender pearls by killing endermans and blaze powder which is crafted from blaze rods which can be obtained from killing blaze in the Nether. Craft eye of ender using ender pearls and blaze powder. Right click with the eye of ender on the end portal frame. Activate all frames to activate the portal.
You can create an Ender Portal using Ender Portal Frame blocks from your inventory and activate it using Eyes of Ender
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.