For a buy signal
Ichimoku Lagging line crosses Cloud from below (Span B from below)
For a sell signal
Ichimoku Lagging line crosses Cloud from above (Span A from above)
For a buy signal
Ichimoku Lagging line crosses Cloud from below (Span B from below)
For a sell signal
Ichimoku Lagging line crosses Cloud from above (Span A from above)
you can check the Ichimoku Cloud strategy from below Expert Advisor page