When you are ready to add phone numbers to be blocked from calls or SMS, simply go to the interface and click Options > Restrictions > Block List Contacts. Then you will see a screen called Block List. Click Options > Add > Number.

You should enter each phone number exactly as it appears when that person calls or texts. For example, if a number looks like 212-555-5555 when it's called, then that's how it should look in the call list. If it looks like 555-5555 then that's how it should look. If you aren't sure you can put any variety of ways the number might look including:

12125555555
2125555555
5555555
1-212-555-5555 
212-555-5555
555-5555

If a number is in the Contacts list, you can easily block it by clicking Options > Add > Contact. Then choose the contact and that contact's number will be inserted automatically.

After you are finished with the additions, click the Back button and then Hide.