Increasing the font size of my tagline

Yes, there is.

Oh, you want to know what it is? Well, without seeing your site, I have no idea. Care to post a link?

??

Sure: https://www.franciscans.org/blog/

Add this to your theme’s CSS stylesheet:

.description {
font-size: large;
}

You can use any of these:
xx-small
x-small
small
medium
large
x-large
xx-large

Or you can use a fixed number or a percentage there instead, to increase/decrease the font size.

Sweet, thank you very much.

One more question, why is it that after I input one of the above tags into my CSS stylesheet and hit “update file”, the changes don’t save?

Thanks in advance.