Mokoena had been missing since April 28, her disappearance becoming the subject of a social media trend as users searched for her whereabouts.
Her charred remains were discovered in a shallow grave in Lyndhurst, east of the city.
Speaker after speaker described Mokoena as a bubbly, fun person to be around who was full of dreams.
"Karabo was so confident and wanted to be so many things," one friend said.
"She was so full of life and had such an infectious personality; she will be greatly missed."
Mokoena was also described as very spiritual and full of faith.
Picture: Khanyisile Ngcobo/IOL
Speakers also used the occasion to spoke out on the recent spate of murder incidents, calling for the brutality to come to an end.
Her spiritual mother, in a fiery message, urged society to take a stand against these crimes.
The service got emotional as Mokoena's friend, Yolanda, read out a poem dedicated to Mokoena.
Mokoena's boyfriend, Sandile Mantsoe, 27, who is a forex trader, has been charged in connection with her death.
He faces charges of premeditated murder and defeating the ends of justice.
His case was postponed to May 24 for a formal bail application.
Mokoena's funeral will take place on May 19 at the Westpark Cemetery.