You can make changes to your account settings by clicking on your profile pic which will further lead you to account settings.
Yes, you can increase the fee for your jobs. There are different procedures followed for mobile and desktop users. Kindly take a look. – Desktop
You can easily edit a job posting and further change the date and save it to get published.
The amount gets deducted when you accept a bid. You will be redirected to a checkout page from where the payment will be done to
The money will be released once the homeowner indicates the job is done on the dashboard. Homeowners will release the money after they are satisfied