Customising colour scheme Sorbet Theme

I have just moved over from wordpress.com to .org and need some help
a) customising the colour scheme on the site. I am using sorbet theme but am unable to change the colour of the menu bar and links to blue. Would greatly appreciate some guidance... (site is http://www.cbcanewday.com.au trying to get it to look like my old .com blog at http://www.cbcanewday.com).
b) I have tried to upload two plugins tonight and both times it got to about 90% and said 'are you sure you want to do this?' then 'try again' and timed out - never gave me an option as to yes or no...
Thanks!!