how to post a picture?  

Try going to http://www.photobucket.com
Create a free account and you can upload your pix there.
Once you've done that, resize your photos to 'medium' size and than copy the specific link below in the "associated web images" space.

In the form to post your...
In the form to post your messages, you will find three fields called "associated web images" that you can use to post images.
No need for fancy codes, no tags like: img src or [img etc.
Just post the simple url of your image in these fields.
example:
As a reminder, if you dont have your own website, there are many sites that can host your images very easily.
Photobucket is easy and free.
http://photobucket.com

How to resize the photos?
I have troubles re-sizing photos.
Or extremly huge or extremly tiny.
Which should be the right size?
Which program use.. directly the www.photobucket?
not so great to me... cause I don't see the real size until many hours later (?).

Gustavo
If you look at my pictures on the Anniversary party thread, the smaller one of me holding up my wine glass is 240 x 320, which is photobucket's standard medium size. The bigger pictures with the dog coming through the doorway and the liquor cabinet are both 479 x 638. Hope that helps.

Thanks Riki, I'll give it a try later.

thx, everyone
Thx for your help. I was able to post the photos via photobucket in a thread today re: chair 'made in yugoslavia'. I appreciate it. Merry Christmas, Happy Holidays.