Have you looked at the advice on FAQ's.
I always have to review it as I forget quite often as I dont post alot of pics.
But log onto photobucket and sign up there for starters.
Upload your pics then resize them (messageboard size!)
the left click on the img tag under your pic to copy
then paste into your post.
If you are on dial up like me, just open a new blank word doc and paste the img codes onto the doc, then copy/paste into BYC post.
Its really easy after practice, however when copying make sure you get all the brackets etc in. then make sure you review your post. then you can test it.
There are some other helpful people here that can explain all this better than I . good luck.
Helen