The JobRoller demo site is by default, logged in with an "Employer" type registration account which is why you do not see features related to the "Job Seeker" account type. As a job seeker, you will see a "My Dashboard" button instead of the "Submit a Job" button that the employer sees. There you can fill out your resume/CV online or make multiple ones and choose which ones are published, view any job listings you have "starred" (favourites), see recently viewed jobs and job recommendations.
I'm not sure what you mean by resumes being "customized"? But if you just mean the ability to create and edit them yourself (as a job seeker), then yes you can. If you're referring to additional options for resumes, such as being able to upload them, then you may like to check out the
FXtender Pro plugin which is an optional add-on for JobRoller available in the
AppThemes Marketplace. Actual job applications are made by the job seeker from within the job listing page "Apply Online" link as shown on the
JobRoller demo site. Thanks.