You cant seek a party in this game. Instead of the method used in 11 where people say " I want to party" and then someone decides to gather people looking. They completely flipped the method around where now someone has to say " I want to make a party" and then people who want a party have to go through a search function that is sort of confusing, and then they will get a list of people who are looking to make a party.
Its like in 11 when you couldn't find a bard or a tank so you hear people shouting in whitegate that they need said job. it rarely ever works. Also when you decide to recruit for a party people can automatically join your party no matter where they are in the world, but you can only recruit for 60 minutes at a time.
I've tried both ends of the coin and I've joined party ONCE since launch that actually killed mobs that i would not have been able to kill solo. All the other times I've looked for parties its some guy needing help with a guildleve or someone who put their recruit requirements at level 1-50 so everyone would see their posting.
Most of the time all using this feature is good for is finding one or two more people to kill the things that you can solo, but doing it a little faster to get more XP or loot from guildleves. Another thing that doesn't make sense is you can make you party and declare what it's for, but the only options are regional leves and quests. So there is no option to say that you just want to EXP unless you put it in the comment at the bottom of the screen.