If you want to embrace Islam, you only need to say in an audible voice the following testimony, understand its meaning and believe in it;

"  that is to say: (I bear witness that there is no deity worthy of worship except Allah, and I bear witness that Muhammad is the messenger of Allah; and Jesus, son of Mary, is the servant and messenger of Allah). "

Now say it in Arabic:

Ash-hadu alla ilaha illa Allahu,

wa ash-hadu anna Muhammadan rasoolullah