For the Single Candidate Portal:  

Please refer to the FAQs on the EU Login help page: How to change/reset my EU Login password? - European Union 

For the EPSO Account:  

Go to this page and follow the instructions. 

We will send you an email with further instructions to the e-mail address in your EPSO account. You will have 24 hours to activate your new password after which the link will not work and you will need to resubmit the password change request. 

If you are still having difficulty in logging into your account, contact EPSO support immediately. 

Note: EPSO staff will NEVER ask you for your password via email. You will always sign in via a secure connection indicated by a little padlock.