1- Go to https://developer.apple.com/
2- On the top right corner, click on Account
3- Click on Create yours now
4- Fill in the necessary information for creating an Apple ID and click on Continue
5- Accept the Apple Developer Agreement
6- Click on Enroll today
7- Click on Continue enrollment on the web
8- Select Company/Organization as entity type, prepare your documents, and click on Continue
9- Fill in the Legal Entity Name and the D-U-N-S Number and click on Continue
After filling in all the necessary information, and your credit card payment for USD 99 for an annual membership, a request will be sent to Apple for validation.
Once the account is validated, you will receive an email. You can then login into your account and grant us Admin access by following these steps: Admin access on Apple Developer Account