Mona, if photosuite allows remote imaging (posting your photo anywhere outside of their site), you can simply use the bbcode buttons above your post.
1) use
Img button
2) next to the img tag,
type in the full url of your image (usually ends in jpg)
3) use
Img button again at the end of your url, which will close your tag.
You can type normal text above or below your image as in a caption.
Or to see examples of the tag code, see here:
Posting options
If photosuite does NOT allow remote imaging, then you can simply post a link to that image on their server.