Phrase Markers are XF Meta events placed in the header file of a MIDI song and are generally put in the song by commercial song distributors such as Yamaha. You can put them in a song, but not using the keyboard - they must be entered using a DAW that allows inserting Meta events - many do.

The code for phrase Marks are found on nearly the last page of the Data List for Yamaha PSR type keyboards.

When a song contains Phrase Markers you get a different bar display when select the song bar advance button and you select Phrase Mark instead of Bar from the Bar popup.

For the marker to repeat at Phrase Markers, you also need to turn on the Phrase repeat feature by going to [Function] -> Song Setting and setting button "I" to ON. This button will be greyed out if there are no markers in the song.

Hope this is helpful.

Bill G