Share button will not work. It says "No service." How to fix? (Yosemite)

I own macbook pro (non-retina). It has the latlest update and I am having a lot of problems. The first one is: When I click on the share button on Safari it tells me "No service." What does this mean? How can I fix it?! I want to add a bookmark and apparently things like twitter and things show up there.
I am very confused and angry. I am new to this stuff and I am young. Please help.
Thanks!

If sharing options and Markup are missing after you install OS X Yosemite

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