When your employee rejoins your company, you don't have to create a new Employee Profile if you are still retaining his/her existing profile. Do follow these 2 steps to re-enter your employee's details:
Step 1: In his/her profile, under Employment Details, remove the Resign Date.
Step 2: Under Current Job Details > View all jobs, create a new job card with the new start date, job title and salary amount.
Thereafter, your employee will have an active account. You can send a reset password link to your employee if needed: https://www.talenox.com/forgot_password