Hi @notea,

Insert the below CSS Codes in Custom CSS Codes field from Dashboard > wpForo > Settings > Colors & Styles settings.

This CSS Code is for hiding the dislike button.

#wpforo #wpforo-wrap .wpf-popover-content {
    display: none !important;
}

This one will hide Joined and Last Seen dates, Last Seen date cannot be hidden separately as both text are in one tag separated with Line Break element(<br>).

#wpforo #wpforo-wrap .wpforo-profile .wpforo-profile-head-bottom .wpfp-joined {
    display: none !important;
}