Well I'm not to familiar with "flicker" if I'm honest. But this is how i do it
1) Take the pic.
2)Put the pic on the PC
3)Upload that to a picture website to get a link e.g image shack Photobucket ect.
4)Go on to a new post in the section you want the post to be in
5)when you have your box for typing up there should be some symbols above it B I U then a mouse icon then a picture.
6)click the picture icon and copy then paste the link of your photo in.