Read Acts 13:5 Using Other Translations
And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John to their minister.
When they arrived at Salamis, they proclaimed the word of God in the synagogues of the Jews. And they had John to assist them.
There, in the town of Salamis, they went to the Jewish synagogues and preached the word of God. John Mark went with them as their assistant.