Can anyone help with Archipelago before I lose my mind?

And if you can, thank you!

I'm playing in a multiworld of just Stardew players, so in theory I should be able to send gifts using Joja Prime according to the site, but it doesn't explain how to do it or if this is even still a feature. If anyone knows how or if it's been removed or something, please let me know! I've only played by myself before so it's never come up, but now one of us only has spring unlocked and I keep unlocking spring seeds as checks but I only have summer so they're useless to me and taking up valuable storage space.

I also don't have a chest recipe or a shipping bin or an upgraded backpack. Life is not going well lol.