To attach an image:
Start a new thread or click reply to an existing message. Click "Attach a File" by "Attachments" and then click Browse to find it on your computer. Click the file. Make sure the file name shows up in the attachments box.
Only certain file formats are allowed: Images with file extensions .bmp, .gif, .jpeg, .jpg, .pcx, .png, .tif, .tiff or .wmf, and GEDCOM files with extension .ged