how do you post pictures from your files??

Computer file?
If you want to post a picture from your computer first you need to make it into a URL I would suggest Imgur
http://imgur.com/
Look under upload images and click computer. Once the upload is complete right click the picture and it should say somewhere copy image url click that. After that come back to the sylestia and for whatever forum you wanted to comment on post url by right clicking and then clicking paste. Once url is posted press and hold the right side of the mouse and drag it over the url till it's all blue. Finally click the blue IMG button and the symbols [img ] [ /img] should appear before and after the url without the spaces. To check if you did it right click preview post.

thx!!