Placing Gann Lines on Metal Charts on MetaTrader 4 Software
The Gann Lines is the fourth option in the Insert Menu within the MT4 Metal Trading Software. Gann Lines Button Key is used to place Gann Lines on the Metals Charts and it's shown below.

Drawing Gann Lines in MT4 Candlestick Metals Charts
Gann Line
The Gann Line is similar to a metals trend-line and to draw this metals trend line a trader must select 2 points and draw this line between these two point, just like the metals trendline the Gann line is also used to show the trend.
However, the Gann Line might require you to change some parameter so that to achieve the draw that you require.

How to Draw Gann Line in MT4 Platform
Gann Fan
The Gann Fan is drawn between two points, this indicator will draw a set of metals trend lines, these metals trend lines are drawn at different angles, This Fan will draw the middle line at an angle of 45 degrees as long as metals price is above this 45 degrees line then the momentum of the upward metals trend will continue as shown below. If metals price moves below this line in an upward metals trend the upward metals trend momentum may be reducing.
The Gann Fan is also drawn for a downwards metals trend and same analysis applied to the downward direction.
Examples of Gann Fan on upward trend:

Gann Fan in MT4 Candlestick Metals Charts
Gann Grid
The Gann grid uses two points just like a metals trendline to be drawn, once these two lines are drawn, this Grid will then draw grids which are at an angle of 45 degrees, the traders can then use these grids for analyzing metals price movement.

Drawing Grids on MT4 Candlestick Metals Charts


