"tell you right then" 解作什麼？

"tell you right then"解作"當時對你說明了"。
例：當你發覺你的好友不聽你的勸告，染上毒癮時，你可以說：Don 't tell me you don't know what'll happen. I've told you right then don't ever touch it. It's dangerous like hell.

Tell me right then! = No need to wait and Tell me now

The above is used in spoken English.
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The proper written English will be:

You need not wait and tell me now.

or

You need not wat and simply tell me now.