You can utilize the drawing tools available on the left-hand side of the chart to annotate with trend lines, support and resistance levels, Fibonacci retracements, and other graphical elements.
Here are some of the available drawing tools:
Trend Line Tools
- Trend Line
- Arrow
- Ray
Geometric Shapes
- Brush
- Highlighter
- Rectangle
Gann and Fibonacci Tools
- Fib Retracement
- Trend-Based Fib Extension
- Pitchfork
Annotation Tools
- Text
- Anchored Text
- Note
Icons
- Arrows
- Currency
The full list of Drawing tools can be found here.