On step 3 you kill enemies outside you go into temple the door opens you go inside you return relic you get a dialog you go back out of the temple the door on the left should be open and you use light saber on small blight and start a puzzle, I've watch multiple videos non of them go back into dungeon they just turn around in temple and force field door is down.

That happens after you clear the first encounter. Not before.

I did dungeon for the first time yesterday on normal it took me 2 days to find a team on lfg it took 1 hour, no wipes, i kill enemies around the ship went into temple for step 2 and placed relic on the left , i got a dialog got step 3 , and both force fields are up, but on youtube they're down. If i have to do dungeon again already, I'll abandon the quest, my friend gets on 1 day a week it will be next monday now for him, so i can only do 1 step a week, as he doesn't get much time when he's on. The fire and ice dungeon i can solo, not equilibrium, and fireteam finder is a joke, EXPERTS ONLY LOL.

And as i already informed you, that step is only active after you clear first encounter…not before. YouTube guides mostly only show the actual quest step being done & not any prerequisites. I completed the entire quest over the last 2-3 days. You are simply not doing it properly. End of story. Each step of the quest (up through somewhere around 5-7) requires doing an orb section, then completing the dungeon, then placing relic.

I did the dungeon, then i cleared first encounter at the ship, placed the relic in temple, now i have to do all the dungeon again? because i can't get to the orb section it's blocked.

Or you can reset it to run first encounter to get door opened.