First thing you have to do is get a online host for your images. I use 

http://www.Photobucket.com

 for mine. 
Its free and you can upload images to post online.

Once you have the images on your host site use the Url addy for the image to put it in the forum along with 
[ img= the Url then ] 
so it will look like this but with no spaces.

[ img=

http://img.photobucket.com/albums/v78/M.A.S.H.4077/

 01-mash.jpg ].

Taken from a post by M.A.S.H.4077 2 years ago

hope it helps :)  

ty very much for your help, just need to figure out how to do wat you explained :p

Okay i'm no expert but step by step i think it's this

First put your image on something like www.imageshack.us This involves uploading your image from your computer (in whichever file it's in) to the site. After this has been done the site will give you a web address that people can use to view your screenshot.

Then you can use this URL address to go straight to the image, so you could put a link in the forum that imageshack gives to you, so for example if i wanted to link to google (www.google.com). 

If you want the image on the forum put [ img (then the address of your image shack picture) ]  But without the spaces.
So for example

[img=

http://snooker.freeonlinegames.com/images/85.jpg

]


This picture is 
[ img=

http://snooker.freeonlinegames.com/images/85.jpg

 ]

(but taking away the spaces between [ img and jpg ] puts the picture in)