How to hide name of the reviewer for the privacy? Thanks

You can do that with some custom CSS. Just add this to the custom CSS setting on the review template...

.wprev_preview_tcolor2_T1 {
display: none;
}
.wprev_preview_tcolor2_T2 {
display: none;
}
.wprev_preview_tcolor2_T3 {
display: none;
}
.wprev_preview_tcolor1_T4 {
display: none;
}

Thank You!