Topic: To increase the font size of the caption

All is said in the title...I don't know how to do this.

Re: To increase the font size of the caption

You can change the font size of a caption using HTML formatting as noted in this FAQ:
How do I add HTML formatting to image captions and titles?

If you wanted to change the font size of all captions in a gallery, then you could add CSS such as the following to the <head> section of your web page:

<style type="text/css">

    /* IMAGE TITLE */
    .jb-caption .jb-caption-title {
        font-size: 24px !important;
    }

    /* IMAGE CAPTION */
    .jb-caption .jb-caption-desc {
        font-size: 24px !important;
    }

    /* IMAGE NUMBER */
    .jb-cap-frame .jbac-number {
        font-size: 24px !important;
    }

</style>