You need to first log out of this UK site, and log into www.ebay.com to continue.
Then, you can change your Private account into a Business account as shown below. You may need to first sell a few items on your Private account.
- Go to Account settings in My eBay.
- Select Personal information.
- Select Edit next to Account type. You may be asked to sign in again.
- Select Confirm to upgrade to a Business account.
- Specify whether you operate your business as a legal entity or as a sole proprietor and select Continue.
- On the following page, enter your business information such as name, contact information, and returns policy. Then select Save.
Probably best to use a PC / laptop for this, and not the app or mobile browser.
@muhammadghouri