How can I add text, graphic or animation to video ?
For example, I want to add "Happy Birthday to David" flashing graphic/text to the video when kid is cutting his birthday cake and a "Yummy" graphic text box on top of his younger sister next to him, to enhance the picture.
I'm using Premier Element 4 to do the editing but can't find such add on function. If PE4 can't do that, what consumer level software can help ?

Where can I download those animated video graphic ? or I have to DIY ?

For trimming video (like cropping picture), is PE 4 able to do that ?