How do I inform IRS of business name change after e-filing?

My IL-based partnership e-filed 2015 taxes, then changed to an LLC.  I understand the IRS still treats the LLC as a partnership, and our business keeps its EIN, but still need to be informed of the name change. Per their website, "Partnerships – Notify the IRS on your current year partnership income tax return (Form 1065). If you’ve already filed your return for the current tax year, you’ll need to write to the IRS at the filing address... For multi-member LLCs, follow the partnership process."

I e-filed using TurboTax Business.  What address do I send the notification to?   (It doesn't look like we filed with an M-3, and made less than $10 million... does that mean to use the OH address from https://www.irs.gov/uac/where-to-file-your-taxes-for-form-1065)?

Also, what should I send?  A blank paper with the old and new business names, and member signature?  A copy of the LLC Articles of Organization, adding old business name and member signature?

Finally, the bank we make our deposits to is waiting to change our business name until it receives "documentation reflecting the change from partnership to LLC from the IRS. Once I have confirmation, I will make the name change on the account."  Will we receive something like this?