Try to look at the link:
http://www.cookbook-r.com/Graphs/Legends_(ggplot2)/
Also consider:
help(theme)
legend.background background of legend (element_rect; inherits from rect)
legend.margin extra space added around legend (unit)
legend.key background underneath legend keys (element_rect; inherits from rect)
legend.key.size size of legend keys (unit; inherits from legend.key.size)
legend.key.height key background height (unit; inherits from legend.key.size)
legend.key.width key background width (unit; inherits from legend.key.size)
legend.text legend item labels (element_text; inherits from text)
legend.text.align alignment of legend labels (number from 0 (left) to 1
(right))
legend.title title of legend (element_text; inherits from title)
legend.title.align alignment of legend title (number from 0 (left) to 1
(right))
legend.position the position of legends ("none", "left", "right", "bottom",
"top", or two-element numeric vector)
legend.direction layout of items in legends ("horizontal" or "vertical")
legend.justification anchor point for positioning legend inside plot ("center"
or two-element numeric vector)
legend.box arrangement of multiple legends ("horizontal" or "vertical")
legend.box.just justification of each legend within the overall bounding box,
when there are multiple legends ("top", "bottom", "left", or "right")
--
GG
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