bbPress.org

each admin link has a class , you can style each to your liking.

here is an example of what i did to make a link in the twentyfourteen theme look like a button.

span.bbp-admin-links a.bbp-topic-reply-link,
span.bbp-admin-links a.bbp-reply-to-link {
	color: #fff;
	background-color: #24890d;
	border-radius: 2px;
	padding: 5px 10px;
}

span.bbp-admin-links a.bbp-topic-reply-link:hover,
span.bbp-admin-links a.bbp-reply-to-link:hover {
	background-color: #41a62a;
}