How do I disable the uppercase for h1 through h6?

you can do this for each heading size, for example:

.entry-content h1 {
    text-transform: none;
}

or…you can do this:

h1, h2, h3, h4, h5, h6 {
text-transform: none;
}

then this:

.entry-title {
text-transform: uppercase;
}

Got it. Thanks!