i can t use the play buttom

For assistance is better to use the forum, see the Handbook under "Revert to factory settings": https://musescore.org/en/handbook/revert-factory-settings-0
controls in the synthesizer if you have installed a sound font. Attach your score here if you want someone to control it.
Meanwhile welcome

First make a try with with Revert to factory settings, then look at:
https://musescore.org/en/handbook/synthesizer
https://musescore.org/en/node/50721
It seems to me a topic for https://musescore.org/en/forum/6