You really need to provide more information if you want help. Don't worry if you don't speak very good English. Explain as well as you can what you want and use pictures if you think that will help.
Maybe you want a mid-measure repeat, like after beat 2 of a 4/4 measure? If so, use Edit / Measure / Split to split the measure there, then add the repeat sign from the palette normally.
Comments
You really need to provide more information if you want help. Don't worry if you don't speak very good English. Explain as well as you can what you want and use pictures if you think that will help.
see https://musescore.org/en/handbook/repeats-and-jumps#repeat-symbols-and-…, there you'll find a measure repeat sign
Maybe you want a mid-measure repeat, like after beat 2 of a 4/4 measure? If so, use Edit / Measure / Split to split the measure there, then add the repeat sign from the palette normally.
I should have done this before...
See https://musescore.org/en/node/279100