Try the following steps to add a new user group in SharePoint:

1. Open the browser of your choice and type in the URL for SharePoint.
2. Sign in with the correct credentials.
3. Navigate to the User section.
4. Click on the Groups option.
5. Click on the New option.
6. Provide a suitable name for the user group.
7. Provide a suitable description for the user group.
8. Provide a list of users that you want to be included in the user group.
9. Verify the settings and then click on Save.