Visit the online filing portal at https://biz.sosmt.gov/
Sign in to the site with your username and password. (If you don’t have an account, click the login button and you’ll see where you can create one.)
Once signed in, search for the business registration using the “Search” in the left-side menu.
Click on the business name in the results list, and find the panel on the right side of the screen.
Go to the Filing Actions button and choose the amendment form.
The form will open, and you will complete the application online. Please read all the instructions and ensure that you complete every form item marked with a red asterisk. Click on the Question Mark icon to see more information about the fields on each page.
Once you have completed the application, click the “FILE ONLINE” button and make the payment with either a credit/debit card or an e-check.
When the application is approved, the system will send you an email. That email will also give you instructions on how to log in to your account and download your confirmation documents.