Yes
Yes, you can use your phone number/email
You can simply login to your account and switch your account to Worker and then you can see 'Post Availabilty' button.
You can simply login to your account and switch your account to Employer and then you can see 'Post a Job' button.
5
5
You can post your availabilty and employers will see your availabilty.
You can post your job and workers will see your post.
Employer will contact you on your provided phone number / email
Worker will contact you on your provided phone number / email