Get 4 gold blocks

Step 1: Nether Portal

Get cobblestone put 5 of them down like shown

Step 2: Nether Portal

Put 1 cobblestone on each of the gold blocks

Put 2 more cobblestone blocks in the middle of the ones on top of the gold then place a nether recreator cove in the middle

Then u put one cobblestone on top of the nether recreator cove then u attatch one block on each side

Wella u have ur portal deffinitly works in survival sometimes works on creative mode