How do I manage my Microsoft Project? (notifications, deletion, and more)...

I finally got a license for Microsoft Project (instead of silly Planner which I cannot use for Agile Framework).  However, I am still having some basic functionality issues with Microsoft Project Online.   I am honestly trained on 2010 version of Microsoft Project, so a lot of these feature changes 

1) How do I control notifications for Microsoft Project Online?  First, I discovered there is these new notifications feature for Microsoft Project that sends out an email every time a even a sub-subtask (aka an action instance) is assigned.   I do not want my coworker or the entire department to receive emails every time I edit a plan.  (I mean 1 email is ok) but with how I work it can lead to like 60 emails....
So naturally I binged it which gave me this result....
Turn off sending out notification to all members Microsoft Project - Microsoft Community

1. From the planning board, select the 3 dots (. . .) to the right of the plan's name.
2. Choose Plan Settings from the menu

There are no settings under any of the 3 dots menu.  So where are the notification settings for an entire project?

2) What is needed to access actual Microsoft Project Online?
Normally I click on a project and simply edit it, but in the desperate search for the actual settings for a Microsoft Project.... I discovered today that I have a weird error.   Something about permission to a SharePoint site.  It did not give me this error before.  I suspect that I might have to make my own PWA site.  Can someone explain to me what this error is about and why the day before I could access Microsoft Project Online but now cannot?

3) How to delete a project?

So, I was able to find a tutorial on this one, but I wanted to ask if there was a better way.
Deleting a project from 'Project for the Web' - Microsoft Community

4) How to control users that are part Microsoft Project Online?
Because how many documents talk about need to be owner to control emails... I tried to make own group in hopes that will give me better control over notifications.   But this led to a discovery that I am in like 15 different groups all with the exact same name as my section and members.   So What settings in Groups are for a Microsoft Project Plan? 

Just an old fashion Project Plan user trying to understand how to use this confusing new Project version.