Hi there, To hire someone you need to register a Client account. Thus register a client account, Because you can't hire someone from your Freelancer profile. Further more, Tell us what's the thing you're looking to hire someone for, So maybe it may be included in any of our services ( The post readers ).
Just to confirm that Noureldin is correct, you will need to open a client profile in order to be able to post a job. To open a client profile go to Settings > My Teams > Create a new account.
If you have any additional questions let me know, thank you.