Some one gave a very useful answer and I want to reciprocate in one way or another. How do I give an upvote?
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migrated from stackoverflow.com Apr 20 '13 at 11:19
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When you have reputation atleast 15, you can vote up a post, see the following image,
For an up vote you need to click on the up arrow (circled in blue) and for a down vote you need to click on the down arrow (circled in red)
To downvote a post you require at least 125 reputation.
Perhaps I'm missing something here because it seems obvious - you click the up arrow, but it won't work until you have 15 reputation (perhaps that's the limitation you're running into?)