It's late, I'm tired, and I have expanded my party to be able to hold two... but how do I add my second pet to it? Lol (and I did figure out the party option is under yhe explore tab)

That being said, I am off to bed but I wondered if there was a whatsapp or discord group to post questions in so that I can get notifications of discussions while I'm not online.

On the party page, you have it set up as

[slot 1-] [slot 2-] [slot 3-]
[set party] [update preset] [create preset]

[preset select v] [load preset] [delete preset] [unlock more preset slots]

[image of first pet in your stables] [info of pet]
[equips on pet]

[stable select v] [pet select v] +

you want the stable/pet select dropdowns
Use these dropdowns to pick the pet you want to put in the party
hit the green + button that's next to them
return to the top of the screen, organize pet order as desired by clicking on which pets you want to swap
hit "Set Party"

(you cannot put a pet that is on a mission in the party, and you cannot change your party pets if you are in a battle) (you can change party order in battle, but that is done on the battle screen not in the party page)

To remove a pet from the party, you hit the red - button in the top right of their party slot image


And to the discord/etc question, not that i'm aware of, but I do haunt the Q&A forum (and places like battle discussion, zone & dungeon discussion etc. if something new gets posted quite a lot so can answer most questions where I feel I have a reasonably adequate answer fairly quickly.

There's also the newbie mentor thread but I don't know anything about that.

There's no official Discord but there is a fan-made one, but idk who runs it and I don't think I'm able to share the link