Putting signs on chests is actually really simple. All you have to do is hold Shift (this makes you crouch) and right click the sign on the chest. This technique can be referred to as "Shift-clicking." This also works for blocks that are capable of being opened while right clicking, such as furnaces and crafting tables. You can also do this with other blocks and not just signs.
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Open the chest and then you will be able to drag items into the chest, in which they will then be removed from your inventory.
Hold shift and then right-click with the lever to place it without interacting with the chest.
Sometimes it is lag. But in this case, it seems like you have a block on top of your chest. If you put a block on your chest, the chest wont open.
you can put up a sign that you can make out of wood and put it at the front of your house
After taming the horse and adding a saddle to it, you can add a chest by left or right clicking the horse, I forget which. Upon death, the horse should drop the chest and the contents of the chest.