Q:

Can't accept answers

I can't accept any answers to my questions. I'm using Safari. The "check" button is not there. Instead, I just see a little flag that allows me to report things.
What am I missing here? I am a new user (3 day old account, 3 day old question), is there a time restriction I am not aware of? 
I don't see this:

I read this page fully:
How does accepting an answer work?

A:

The questions you have posted don't have answers. They only have comments.
If you see the upvote button + the little flag you describe, it's a comment, not an answer.
Answers can get upvoted, downvoted, and accepted. Comments can only get upvotes.
If someone comments an answer to your question, you can ask them to re-post it as an answer. Answers shouldn't be posted as comments.
 By contrast, this is an answer, and you should be able to accept it if you want to 

