You can add attachments when you post a new post. You should see a Add an Attachment form below the main posting box. When you click the Browse... button the standard Open dialogue window for your computer will open. Browse to the file you want to attach, select it and click OK, Open or doubleclick according to your liking and/or the correct procedure for your computer. If you choose to add a comment in the File Comment field this comment will be used as a link to the attached file. If you haven't added a comment the filename itself will be used to link to the attachment. If the board administrator has allowed it you will be able to upload multiple attachements by following the same procedure as described above until you reach the max allowed number of attachments for each post.