If you want to change the font size of the comments text inside the OptimizePress blog system this can be accomplished with some simple CSS. Use the following code and customize the values to fit your desired style.
Add these codes inside Blog Settings > Modules > Other Scripts > Custom CSS:
.comments-container .comments-panel p {
font-size: 20px !important;
line-height: 27px !important;
}
To change the comment author name individually use this custom CSS:
.comment-meta p {
font-size: 20px !important;
}
To change the comment date use this custom CSS:
.comment-meta span {
font-size: 20px !important
}