We're going to edit the mesh manually, so we need to make the geometry easier to work with.
With the mesh selected (it will have an orange border around it), press the Tab key to enter Edit mode.
The mesh will highlight every edge and vertex in orange, indicating that they are all selected.
With everything still selected, press Alt+J to turn the mesh into quads instead of triangles.
Some of the squares along the sides might not change; that's okay. Areas that you need to edit will typically be turned into quads.
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Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
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