How did white Northern Abolitionists help with Underground railroad?

There was a secret way to get to the north and there were several different paths to go on. Most of the beginning slaves would be mett by Harriet Tubman and she would either lead them herself, or tell them where they could run to. The first stop usually was an abolitionist house in disguise. The people who would take care of, hide, and feed the slaves would have a lantern in their window to show them that they were friends. So overall, the white Northeners sheltered, hid, fed, and pointed them to the next stop so they could make it to the north, or Canada, to freedom.

Also, note that without these white abolitionist (mostly the Quakers), there would not have been an Underground Railroad. There were many other "conductors" on this railroad, but Mrs. Tubman is the most popular.