Trailing stop on an existing brokerage position

How do I close out an existing brokerage position with a trailing stop. Meaning the position was not opened by Zorro.

The manual suggests that Stop and Trail can only be set before the enterLong/enterShort call.

You can set stop and trail later in a TMF, but the position must be known to Zorro. Zorro cannot take over a manually opened position.

Thanks for clearing up that jcl.