How can I get two buttons to appear on the same line on a blog post?

Sure, I add one button, add a spacer bar, and drag it next to the side of the button where the second will be. Watch the vertical blue line, make sure it is no taller than the button block.  Then add the second button on top of the spacer bar, and delete the spacer bar that has moved below the button bar. You can then shift the position of the buttons left and right. That's all there is to it. This works for more than two buttons on a line as well.