Drag the two white handles. The orange line is how the value changes over time: steep means fast, flat means slow. Above the box overshoots, below anticipates.
Tap Clips and pick videos or photos. They line up on the bottom row.
Move the red line and tap Split. Add Text, Shapes, Music and moves from Animate.
Tap Export, then Save. Your work also saves by itself as a draft.
Drag things on the picture to move them. Drag a corner dot to make them bigger, the top dot to turn them. Two fingers work too.