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STEP 2: Select browse and find an image that you want to upload. Select that image and press OK/Open. Then press the "Host it!" button.
note: Make sure that none of your images are too big. Images greater than 1024kb will not upload. To find out your image's size, please right-click on the icon of your picture and select "properties". There, you will be able to see the size of the image in kilobytes. Most images, however, are much smaller than the 1024kb size limit.
Also make sure that your image is of the allowable filetypes, which are .jpg, .jpeg, .png, .gif, and the .swf flash file. ImageShack also accepts bmp, tif, and tiff filetypes.
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STEP 3: After a short while (depending on your image size), you will see a number of boxes with links to your image. Depending on your use for the image, select any one of those links. (you may use the hotlink forum 1 option). Highlight the text inside the box then copy and paste it to your desired forum topics.
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If you have further questions, you may post it to this thread.