this will work I have had to do the same thing before...
(1)sign in to your blogger account then go to layout (you will be on page elements) go to edit html tab
(2)once there you will see the layout code you just replace that's where you need to do the editing
(3)click in the code it dose not mater where once you do click and hold down ctrl+f once you do a search bar will pop up on the bottom (with firefox its on the bottom)(with google chrome its on the top I think)not shore about internet explore.
(if you know anything about links it will look like this
words
what you will need to do is type the word part into your little search bar that just popped up it will look like the code above.
the bar that popped up will have a X to close it and then the word find:in that space type the word contact or about or what ever you want to change once you find the word contact it will look like this
about (if you have a about page or about post take the link from that page or post and copy and paste it into the link part and then just leave the about...
but the easiest way to find the link to change it is to go to your layout page and edit the html coding and open the search bar by clicking in the code box and holding down crtl and f at the same time and then just putting in the word contact or what ever into the search box that pops up it will highlight that word in the code it finds the words that matches the words your looking for...
its actually kind of easy...
Good Luck and God Bless...