CV upload and cover letter are the mandatory fields of candidates dashboard, as no candidate profile is complete considered complete without these more over its actually your presentation and your level of professionalism. And with job career candidates have this option built in to candidates dashboard. To add CV and cover letter login to your dahsboard and you will see in like following screenshot.
Select your CV ( make sure your CV document have valid extension from the allowed extension list ). and Add your cover letter and Hit update and you will see success message with CV uploaded and cover letter saved just like below screenshot.