How do I change the color of trendlines?

I am on MT4 and I can't figure out how to change trendline colors. Can anyone help? Thanks.

Double click the trendline.
Three handles will appear (one at each end and one in the middle) indicating that the trendline is "selected".
Once selected, right click on the trendline and then click on Trendline properties.
Change the color in the dialog box that appears.
Close the dialog box.
Double click the trendline to de-select it.

BTW, while the trendline in selected, you can adjust it by dragging the handles. If you hit the delete key on your keyboard, a selected object will be deleted.

Dial

Great tip!