The link didn't address my issue but thank you anyways.

But I did learn of a webinar mentioned by you that will be useful.

The IRS webinar Taxation of Nonresident Alien Individuals takes place on Thursday, Aug. 17 at 2 p.m. ET. Participants will be eligible to earn up to 2 continuing education credits for this webinar. For more information about the webinar and to register, visit the Webinars for Tax Practitioners webpage.