Menu Problems

Hi,
I am trying to add a “promotions” page to our website.
I created the page, added some content to it.
I tried to add it as a subitem of the “Events” item in our main menu.
When I drag it slightly to th eright it indents, but once I save it, it goes back to being a menu item, not a subitem.
I have tried for a hour to understand what I am doing wrong, t=it shoudl not be this hard to edit. I thought that this is what wordpress is all about, ease of use.
The page is a child of events page.
Also on the events page there is a sub menu that does not have the “promotions” page on it. I suspect once the promotions item becomes I sub item it will play nice.
HELP, I am at wits end