Welcome to the forum, Bubalub! It's great that you're deciding to turn your weight around and that you've decided to do it in a healthy way. I think it's wonderful that you're doing this out of love for your body rather than hate. So often people come here feeling like their body is the enemy. By treating your body with the love it deserves I think you're already half way there!
There are two ways to post photos on the forum. The first option is to upload the photo as an attachment. If you look below 'post a reply' text area box where you type you'll see two tabs. The default one is 'Options' and there's another one 'Upload attachment'. Here you can browse files on your computer to attach to your post. Personally I'm not fond of doing direct attachments because the pictures always seem to require scrolling to see them all.
I prefer to upload them to an online photo account, then paste the link in as image code. I use a site called Photobucket
. You can create a free account then upload your photos. You can even resize them on the site. Then just take the image code that's supplied for each photo, for instance [ img ]http://www.photobucket.com/wombatphotos/myimage01.jpg[ /img ]
and copy and paste it into your post where you want it to appear. Or copy the direct link without tags, paste it in, select it, and click the 'Img' button above the text area. This method has the added advantage of creating your own permanent gallery. That way you can re-use photos whenever you feel like it rather than having to search them out on your computer and upload them again.