Please add an item in-game to show one the basics of this great mod. It's only the logical thing to do. Thanks.

A wiki is being worked on.
https://the-undergarden-mod.fandom.com/wiki/The_Undergarden_Mod_Wiki

Much appreciated for the quick response, but will this be in-game? It's not very immersive when you always have to leave the game screen to figure out something as basic as making the portal.

The instructions on making a portal are on the curseforge page...

You obviously don't get my point. Well, it was a request. Thanks anyways.