It's a bit embarrassing to ask such thing, because nobody but me seem to have the problem.
Simple drag and drop doesn't work, does it?
They should insert themselves when you click them without you needing to drag and drop them but if that doesn't work, you can always type them like this (just omit the )
<:confused:> = :confused:
<:angel:> = :angel:
<:redface:> = :redface:
<:o> = :O
And they will only be visible once you post your message but not while writing it.
Does it work?
Oh, I see, thanks