Hi, and thanks for your post! To set a color for an individual swim lane, click once to select the entire swim lane shape, then click again on the header of the individual lane that you'd like to style. From there you can change the color of both the header and lane using the swim lane menu on the right side of the editor. I’ve demonstrated this in the GIF below:

Regarding deleting an individual swim lane - simply right click on the lane you want to remove and select Remove Lane from the menu. 

Please feel free to use this Add and format swim lanes in Lucidchart article from our Help Center as an additional resource and post questions below!