I would suggest you watch the tutorials in this list for Movie Edit Pro (MEP) which is now called Movie Studio (MMS)
Though made with with older versions of MEP, the principles are the same for MMS the only major difference is in the Size, Position & Rotation effect which has a different behaviour and are combined into one effect dialog.
There is also a manual available under Help in the program.
In the event of the tutorials not covering what you are wanting to do, or a technical problem it would help if you put your computer specification and program version, see this topic for what is required and please quote processor and graphics card make/model in full in your profile signature so we do not have to keep asking for it.