How to set the position of FIB retracement?

This option is available when the logarithmic scale is enabled on the chart. In Coordinates properties dialog, you can set precisely the position of the Fib Retracement by setting its trend line's position on the price scale (by setting the price) and the time scale (by setting the bar number):

How to change the appearance and configuration of a fib retracement?

In Style property dialog, it is possible to change the appearance and configuration of a Fib Retracement: The checkbox toggles the visibility of the trend line and switches beside set it's color, opacity, thickness and style. Sets thickness and style of the levels' lines. Checkboxes on the left toggle the visibility of additional levels.

What is FIB retracement?

The Fib Retracement tool includes the ability to set 24 different Fibonacci levels (including the 0% and the 100% levels that are defined by the two extremes of the trend line that is originally drawn). Values between 0 and 1 are internal retracement levels.