How to stretch the width

[C0D3D]

http://i56.tinypic.com/2mn3wib.png

How can I make it so the width can stretch out horizontally(make it fatter)?

[Lynne]

Make what fatter? If you are talking about the forum width, then change stylevars doc_width and/or doc_margin, whichever you are using to set that width.