Ender Portals are unbuildable in Singleplayer, but if you go into creative mode, you'll find the End Portal Frames and Ender Eyes in one of the tabs, the only way to find them in Singleplayer survival is to use Ender Eyes to follow and find the location of the Strongholds of the Portals.
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There is no way to build an end portal except on creative mode, instead you must find a stronghold which contains a portal using eyes of ender. The portal must be activated with 12 eyes of ender before you can travel to the end.
You can create an Ender Portal using Ender Portal Frame blocks from your inventory and activate it using Eyes of Ender
You have to put 12 eyes of ender in each of the portal blocks. Then, it should activate.
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.
In pure survival, it is impossible to make an End Portal Frame. If you encounter a naturally generated portal, you must place eyes of ender in each of the frames. An eye of ender is crafted by an ender pearl and blaze powder.