You will need to go to the "Employment Opportunities" tab and click the "Search Current Openings" link. Scroll down until you see the position you would like to apply for. Click on the link with the position name and scroll down to the bottom. Click the "Use Existing Resume/CV" button at the bottom of the page. Once you have clicked on that, you will be able to see previous positions you have applied for. Click on the "Submit this Profile" link next to the resume/cv you would like to use. You will be asked to log back into your profile using the username/password you originally set up. Click submit and you should receive a confirmation message on the screen letting you know your submission was successful.