How to do humanitarian work while doing a full time job
While working a full time job? You can join Rotary, Kiwanis, Lions Club, or other service organization that support humanitarian programs with their time, money, and expertise. You can volunteer evenings and weekends. Alternatively, you can make donations directly to reliable humanitarian responders online - there are many good ones including UNHCR, ICRC, UNICEF, IOM as well as international and local NGOs.
You can volunteer online, outside of work hours, via UNV Online Volunteering service
You can volunteer onsite, locally, doing work that relates to humanitarian work in your own community: helping refugees, helping people who are victims of domestic violence, helping educate the public about HIV/AIDS...