I am making a movie with the IMovie App and cant work out how to reduce the time that a still photo remains on the screen. The standard time is 4 seconds and I would like to reduce it to about 2-3seconds. And I need to apply it to all the photos and

Simply hover your cursor over the right hand edge of the clip in the timeline and 2 arrows pointing left and right will appear.

Drag the edge of the clip to make it longer or shorter.

Alternatively select iMovie in the menu bar and click on the Preferences.

Change the "Photo Duration" to your desired time. This will only affect new photos added to the timeline, existing pictures in the timeline will remain at 4 seconds.

Adding to what Ian said: For photos of undesired duration already in the timeline, you can select them as a range (as long as they are contiguous) and then click on the "i" button in the tool bar at the upper right of your screen. You can then enter a duration in the duration box that appears below and to the right of the "i" button. Then click on the Return button on your keyboard. That will set all the photos at the duration that you entered in the duration box.

EDIT: You can use the same procedure above to set the duration of each photo individually.

-- Rich

Drag your chosen title down to the timeline and position the playhead over it so it shows up in the viewer.

Then double-click the writing in the viewer to make it turn blue.

You should now be able to type out your title on the keyboard.

Apple Music cannot be used in iMovie because it is DRM protected. Syncing it or downloading Apple Music to iTunes will not remove the DRM protection.

In the Sound Effects item in the iMovie sidebar there are jingles available that you can use in your projects. However, you might consider purchasing new iTunes for use in your project. They only cost 99 cents.

— Rich

In 2009 iTunes eliminated DRM protection for the songs that it sells. I think that you can rely on that with confidence. If on the very unlikely possibility a song you purchase still carries DRM protection, then you will have lost 99 cents.

-- Rich

If the photos were not contiguous could you go along the timeline clicking each one whilst holding down the Command key and then change them all simultaneously?

Yeah, you could select them individually. I never tried that, but I see it can be done.

-- Rich