First, I would like to point something out. If you need help for uploading your maps into this site, please only ask once. Don't create two threads and post in another thread for it. Read the rules here for more information.
To upload a map into a post:
Click on the 'Post Reply' button at the end of the thread. Scroll down and then click on the 'Manage Attachments' button. A window will pop up. Click on 'Browse' choose a file with a valid file attachment. Then click on 'Upload'. You can upload another file if you wish. When you are done, close the window and then click on 'Submit Reply'