Go to View > Snap to Point. Also make sure View > Snap to Grid is not checked, or it might keep you from snapping to the points of the web. Even if the grid is not visible, it is still there. When Snap to Grid is enabled, it will still snap to the grid even if you can't see it. Select the line tool from the toolbox and draw a 1 pt line from one point of the outer web section to the opposite point of the outer web section. Repeat, drawing lines across all points. Repeat for each point of the web. Select all parts of the web and cmd/ctrl + G to group.