For posting images, since you have that image hosting account already, you can use it to host the pictures before you include them in your post. here's what to do:
Post the picture(s) up on the www using the image hosting account site, then to include it/them in a post you click on the second icon from the left of the fourth grey box of icons from the left, of those icons above where your writing in the post goes (the "Insert an image" icon). Then you paste the image URL of your photo under "URL:" and (optionally) the size you want it to be [under "Width (optional):" and "Height (optional):"] in the box that appears.
I hope that helps. Have fun with the forum!