Map editor borders

Hey how do i make borders on map editor, i cant seem to figure out how.

Make a square to test, the beginning point and the end point must connect. Each borders beginning point and ending point must connect.

Wr1tt3n by Helly, 14.01.2019 at 15:17

Make a square to test, the beginning point and the end point must connect. Each borders beginning point and ending point must connect.

i did connect the ends but nothing would happen but ill try when i have prem again