By default, the platform does not have this option. You can use the following CSS code.
NOTE:
The code below will allow you to change the Like Icon on your Heart Icon. Please note that BuddyBoss Theme 2.0 uses a different set of icons. Please check the link for your reference.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
.activity-list .activity-item .bp-generic-meta.action .fav:before,
.activity-list .activity-item .bp-generic-meta.action .unfav:before {
content: "\eeb2";
}
4. Save changes.