You are in Pakistan, here in the UK a selling account has to be established with successful sales before being able to promote items.
Log out of here, log into www.ebay.com see if it allows you to promote your items, the rules may be different in your country. If there are still issues, contact eBay Customer Services they will tell you when and how to promote items.
Contact eBay Customer Services this way, through their help pages.
https://www.ebay.com/help/home
Lines are open between 5 a.m. and 9 p.m. Pacific Time
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