Hi Sam,
1) You can change header colors by clicking Color Customizer in the top bar when in WordPress.
2) Custom CSS in the theme options:
.team-member .team-member-name, .team-member .team-member-position {
text-align: center;
}
3) We had to disable that due to Twitter API 1.1 and their design requirements, which do not allow any custom designs for Twitter feeds anymore. I’ll let Ed know to remove the advertising of that feature, in the meanwhile this is the only option: https://dev.twitter.com/docs/embedded-timelines
Regards,
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Cosmin
Support Assistant