Find this in your theme style.css file and replace color:white to something else.
a.button, a.comment-reply-link, #commentform #submit, .submit, input[type="submit"], input.button, button.button, #wrapper .woo-sc-button
-moz-appearance: none;
background: none repeat scroll 0 0 #428bca;
border-color: rgba(255, 255, 255, 0);
border-radius: 3px;
border-style: solid;
border-width: 1px;
box-shadow: 0 0 0 0 #888;
box-sizing: border-box;
color: white !important; /* <-- change here */
cursor: pointer;
display: inline-block;
font-family: inherit;
font-size: 1em;
font-weight: 200;
line-height: 1.618em;
overflow: visible;
padding: 0.327em 1em;
text-align: center;
text-decoration: none;
text-shadow: none;
text-transform: uppercase;
white-space: normal;
width: auto;
}
or see Canvas documentation on how to modify button colors.
@danbp thank you for your reply. Sorry for asking such a basic question but how do I find and access the theme style.css file?
Read your theme documentation.
Also here about premium theme and what you can expect as help from here in such a case.
https://buddypress.org/support/topic/when-asking-for-support-2/
