How do I get to the Nameless king and Storm King?

[Bright]

I beated the game and Indont know how to get to them. I thought they were main bosses.

[MrRaggaedeman]

Kill Oceiros. Get the path of Dragon gesture and perform it in the Ithryll Dungeon at the cliff with the Dragon Bodies. Wait a few seconds.

[dxmc]

You have to get the Path of the Dragon gesture after the Oceiros fight, from the area just past Ocieros. Then you have to go back to Irythyll Dungeon. Towards the end of the level there's a short pathway, just past the area with the big group of jailors, go up that path until you see a dragon statute. Make the Dragon gesture and you get transported to Archdragon Peak.

[76561198308101990]

I don't know which bosses you mean because they should be the same, but I will go out on a limb and guess that Nameless King is what you are really looking for.

To get to him go to the dancer bonfire, go up the ladder and turn >left< .. clear the area, kill Ociros (consumed king) follow the path behind his boss arena and get the Dragon gestuer from the corps displayed infront of you.
If you have all shortcuts unlocked warp to Irithil dungeon.
If you haven't unlocked them all go to the Profined.. found...city ... The one after the dungeon bonfire.

Irithil Dungeon: Cross the bridge in the middle of the large room where you first meet the soldering iron wielding guys and turn left on the other side (face away from the single robed soldering iron dude) and follow the path to the end, drop down to your left and head through the door. This should lead you to a small outdoor area with dead dudes sitting around everywhere.
Between 2 of them will be a carpet with a nice view on a mountain range.
Step on the carpet and use the dragon gesture -> Welcome to Archdragon Peak, home to the Nameless King.