Hope this answers your question:
"At the launch of Express Entry, you will need to create a Job Seeker Account with Job Bank if you do not already have a Canadian job offer or a provincial/territorial nomination. This will give you the opportunity to view jobs available with Canadian employers. It is important for Express Entry candidates to promote themselves to potential employers/recruiters and use private sector job boards and other resources to learn about jobs available in Canada.
Note: Candidates who create a Job Seeker Account with Job Bank between January 1 and January 25 will need to return to their Job Seeker Account after January 26 to create their profile. After January 26, candidates will be able to create their Job Seeker Account and profile without delay."
This information came from the FAQ section on Express Entry, from the CIC website. Take out the spaces on the link below to find the info.
http: //www .cic.gc.ca/english/department/media/notices/2014-12-01.asp#21
