Trying to have Donate button click out to new page

Site URL: https://www.growingheartevents.com/

Hi friends- I am using the built in donate button on my page www.growingheartevents.com and since it is a splash one- pager- I want it to open in a new tab, like every other link on the site. This is not a built in function on the site. event when I try to create a button that clicks out to the donate page- if the donate button is not there as well- it is a lost link. Any ideas?