Uh, well, I often have to ask for help myself. do you have any pics uploaded to your BYC storage? If so, you click on uploads (blue bar above) and a new window will open, then in the bottom right, click on my uploads, then go to the pic you want and copy the link for the picture and paste it in a post. If that doesn't work, then double click on the picture and it will come up in its own frame. Now copy and paste.
If you don't have any uploads yet and it isn't working to just browse for pics, then you will need more help than I can give.
Hope that helps
ETA- if it doesn't, then either search here for help uploading (I am sure someone has asked before) or post a question in whatever section you want to post the pic in.