Plotting in R using ggplot2

Change title of legend
scale_fill_discrete(name = "Fishing method")

To hide y-axis scale

par(mar=c(4, 4, 2, 0.5))
par(mar=c(2,2,2,2))
ggplot(mtcars,aes(x=factor(cyl),y=mpg))+
geom_point()+
theme(axis.text.x = element_text(colour=”grey20″,size=20,angle=90,hjust=.5,vjust=.5,face=”plain”),
axis.text.y = element_text(colour=”grey20″,size=12,angle=0,hjust=1,vjust=0,face=”plain”),
axis.title.x = element_text(colour=”grey20″,size=12,angle=0,hjust=.5,vjust=0,face=”plain”),
axis.title.y = element_text(colour=”grey20″,size=12,angle=90,hjust=.5,vjust=.5,face=”plain”))

theme(axis.text.x=element_text(colour=”grey20″, size=10, face=”plain”))