Once you have completed those steps, you will need to set up the account by listing it in your name, address, e-mail, etc. After that, you should be able to choose a rate plan -- in your case, the $25/monthly plan. Review everything you've entered so that everything matches, and the information will process.
When finished, you will get a new phone number that will be assigned to your account. Place the newly-activated SIM into your phone, add money to your account, and you may then begin using your phone.
If you run into any questions, feel free to comment. Good luck.