Hi.
Thank you for contacting us.
1. We don't support the Adsense in between every 4 jobs on the job listing, we only support the AdSense on the top or button of the job listing. To do that, please add the AdSense code at customize/ Job & Company/ Job List/ Inset custom content field input.
2. At the user account page. We also don't support that feature. You need to change the source code to add AdSense. Please check the code at folder: wp-content/themes/jobica/layouts/dashboard. It includes all the layout of the front-end dashboard page.
3. To page sidebar, please go to widget management and add the code to each widget you want to show the sidebar as Main Sidebar, Job Sidebar...
Please check it again.
Thanks.