Use Pencil tool

Pencil tools let you draw a thinner line freeform.

1. Click pencil tool in the left toolbox. Screenshot 2014-09-26 13.48.08
2. Click and hold mouse on the canvas and drag to draw a link freeform. Screenshot 2014-09-26 18.21.19
3. Then release mouse click, you will get a line. Screenshot 2014-09-26 18.22.23
4. Finally, you can use stroke style setting to edit the line: Screenshot 2014-09-26 18.23.26

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