Yes, you can edit your job listing once posted. However, it will require a review, once your revision is reviewed, it will be republished. 

You will need to consider buying a suitable package for your job posting need. No additional fees is charged if your actions are under the package limits. 

Refunds can be requested within 7 days of purchase. Published jobs will be removed after the refund is processed. 

You can get suitable package to start posting the job listings. Thereafter add/submit your company details. Once approved, you can start posting job posts. 

Yes, you can upgrade your package anytime you want to.