Hi Myriam. Yes, this option exists.
If the user is able to login to his/her account, after logging in, the user needs to click on his/her profile picture> Account Settings> Reset Password:
If the user forgot the password and cannot log in to the community, in log in page, when you are inserting your email, there is an option to "Forgot Password":
Once the user clicks on Forgot Password, an email will be sent to the user with a link to reset the password.