1. Open Orient Finance App and select the stock or futures contract to be drawn.

2. Enter the K-line chart page of stock or futures contract, and find the position where you need to draw a line.

3. Find the line drawing option in the toolbar at the bottom of the page, and click to enter the line drawing mode.

4. In line drawing mode, you can select the line types to be drawn, such as horizontal line, vertical line and trend line.

5. Click and hold down the starting point of the line to be drawn, drag it to the end point, and then release your finger to finish drawing the line.

6. If you need to modify or delete the lines that have been drawn, you can click the lines to edit or delete them.