Once you've created a Private Profile and claimed yo not represent any company, you can still join an existing company.
See guide how to create a profile.
Request to Join Company
The first five steps to converting the account is the same both for Convert and Request to join.
- Hoover over your Avatar in the upper right corner.
- Go to Account Settings. 
- Go the option Convert to Company Profile/ Request to Join Company 
- Click on the button Request to join / Convert
- A pop-up will show - if you want to continue click Yes, convert my profile
- Select the country of registration for the Company you are converting to or to join. Enter the VAT number

Request to join existing company
- If it is an existing Supplier (VAT is already registered) 
- You can now request to join the existing company 
- Click Ask to join  
- You will now be asked if active applications should be migrated to the company you have requested to join.  
- Mark the Job Request applications that should be migrated to the Company you have requested to join. 
- Click Migrate (If you don't want to migrate any applications - click Skip Migration)  
- A notification is sent to the Admin of the Company you request to join, when the admin has approved your request to join you will become a member of the company. 
- You will recieve an email confirmation that you request to join the company was accepted. 
