Hi mks.
Let's say that you want to put a link to this question in your homework.
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The easiest thing I've found is to :
1. go to the first post you want (in this case, your first post in this thread);
2. put your cursor above the information that identifies that post. In this case, it's
Code:Post: 2080808 - About placing links
.
3. right click on that spot (in your original post), and you should get a list of things you can do.
It depends on which browser you're using exactly what that list will say. I use Firefox, so my list includes "copy link location" and "copy". If my homework was being submitted, I would select "copy link location", and then "paste" the information into my homework. If the teacher was simply going to read a hard copy of my assignment, I'd use "copy".
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If you can give a bit more information about what browser you're using, and how your homework is given to the teacher, I can try to help you some more with this.