To change the tempo in Musescore, there are several options. One way is to log in to your Musescore account, go into Edit mode on the tempo mark you want to change, and edit the metronome number or beat note. Another way is to display the play panel and move the tempo slider up or down as required. You can also select the tempo mark, untick "Follow text" in the "Tempo Marking" section of the Inspector, and set the desired playback tempo in the "Tempo" field underneath. In the mobile app, you can adjust the playback speed as a percentage of the original tempo using the Tempo slider. Finally, you can change the tempo of the metronome by dragging the metronome marker on the play panel or by editing the tempo text in your score.
I hope that helps! Let me know if you have any other questions.
