Symbol related to repeat playback

Thanks. That helped with one version of my song -- where I added actual notes to replace the symbol that looks like a divide symbol. See attached song -- where the only thing to click on is the divide symbol -- which then places the "blue arrow" in the middle of the last measure rather than at the end like I want it. Other changing that last measure to notes, is there a way to move the arrow to the end of the measure. Also -- what is that "divide symbol" called -- so I can find out more about it.

One other thing is that the picture of the playback loop in the musescore handbook must be outdated since the picture shown on my version is slightly different. I was able to figure out some of the things as is, but it would be good to have that updated so the handbook picture matches the most current version.