FCP X Doubt

How can I insert a logo on the corner in FCPX like tv icon?

Actually you just put it here. Drag (or use Q) your image above your video and position it with the trim tools.

You'll want to use an image format with an alpha channel. A PSD or PNG works best.

Thanks a lot tpayton!

Also you don't even need to import your image first. Just drag it from the Finder to the timeline.

But be sure the Import settings in Preferences are set as you'd like them before you drag-and-drop anything into FCP X. I'd import it, I'd want to be sure it goes to the proper Event, gets keyworded/tagged properly, etc.