Click on the 'IMAGERY' icon on the left-hand side tool bar.

Click on the 'NOTES' button on the top right-hand side of the screen.

Click on the three dots next to the Notes name and select the "Edit layer" option. You can see what objects are already in your note by tapping or clicking a Note’s name to expand it.
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The note editing tools will appear on the bottom middle of the screen, where you can select the line icon.

To start drawing tap or click anywhere on the map and move your finger or mouse around to create a line by tapping/clicking where you want the vertices. Double tap or double click where you want to stop drawing.

Give your line a name and an optional description eg. “Fence line removed 2017”.

Select a colour and line thickness. 

Click the 'Save changes' button.

You can discard your line at any time to start over by tapping or clicking the 'Discard' button.

To edit an existing line - click on the three dots next to the name and press 'Edit", and don't forget to save changes.