If your pictures are small, 600 x 600 pixels or less, you can create an album in your account and copy the images from there. You can put a larger picture than 600 pixels squared but the album storage will shrink them and the quality will be reduced.
Goto my account, create an album, upload the pictures. You can add captions and editing the pictures when they are in the album will provide links you can copy and paste.
For some examples of albums click on my avatar and browse my albums.
For big pictures I use imageshack, which is free, you just need to register. You must be sure to select Don't Resize when you upload the pics. Image shack and similar sites will provide you with links you can copy and paste into your posts. Image shack link is not as reliable as keeping the pics in your edgegamers albums but you get to use bigger pics so it's your call.
Remember to keep them suitable for primetime tv. We're kid friendly here.
Hope this helps.