Help on a pc

So my husband has a Ryzen 3 3100 3.6GHz (picture of the pc) and we’re trying to get the front glass off to clean it, hoping to solve a loud fan and possibly a lag issue. Does anyone know how to get the front glass off??? Thanks

So my husband has a Ryzen 3 3100 3.6GHz (picture of the pc) and we’re trying to get the front glass off to clean it, hoping to solve a loud fan and possibly a lag issue. Does anyone know how to get the front glass off??? Thanks