Customising colour scheme Sorbet Theme

I have just moved over from 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 trying to get it to look like my old .com blog at
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...