marleyman Hi
I'm also using Mac and it shows correctly on the right side of the main menu:
Please note that this donation button is not there on our demo site of this template by default, this is customization task and out of our support scope. We just tried to suggest you the way to customize it: update layout and custom css, how it looks on different views will depend on your own customization. For example, as our above suggestion, you can use media queries to add custom css to different view ports.
@media screen and (max-width: 970px){
/*your custom css code goes here*/
}
With this query, you can put your custom css for small screens like mobile. At this moment, on mobile view, there will not enough space to show both logo and the donation button in the same line so you can decide how you want to show both and add custom css for it.
In case that you're not familiar with coding, you should hire a developer to get it done for you.