I have made a offering brazier(on 1.16.5),but I don't know how to use it(Perhaps I‘m silly).Can you tell me?I'm new to this mod,so please be as detailed as possible.Thanks very much!

Right click it with an item to transport to the inner realm (I believe you can't put in chests or other items with a block entity) and then right click it with a fuel item (charcoal, coal, etc.) and it'll slowly transport items to the inner realm. One caveat is that it will destroy water and potions and will apply the smelting recipe of the item if it has one (wood turns into charcoal, ore turns into ingots, etc.)