issue with plus sign

hi there first of all I was just wondering to know how can I change the icons and also how come I don’t have the plus sign with any version and also is there a way to add more to this plugin like adding upload videos from computer and also provide a preview link box to this plugin.

please contact me at [email protected]

http://ww.wp.xz.cn/extend/plugins/buddypress-activity-plus/