There is a setting under character configuration called auto-chat or something simliar that will automatically put anything you type into the chat window, so you don't have to worry about selecting it before typing.
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1: You need to focus on accessories with vitality, drop all that dex.
2: Like someone else said, mark the targets.
3: After the pull use a few flash.
4: Enmity combo.
5: Now you can start to learn when to use cooldowns.