When I'm in Sugar, I'm usually in Reports. When I'm in Reports, it's usually because I'm working on a data project for one of our executives. I want to make sure I don't "lose" the report after he/she has shared the location with me the first time, so I immediately mark it as a Favorite so I can find it easily the next time I'm in Sugar.
To the left of your report Name, is a star. Click it.
On the top left of the Reports pane, is your Filter drop down. Click My Favorites from the drop down and any report you've marked as a favorite will appear.