Need Help Customizing a Wrapper with Blogger

[Beth Swann]

I've just spent several hours pouring over the internet and reading all the information I can find but I still can't find my answer.

I'm trying to customize my blog. And as you can see, the main wrapper or outer wrapper (not sure which is which) is too narrow. I've adjusted the width in the HTML both directions and nothing is helping.

I did create a custom wrapper so maybe that's my problem. However, I've done a regular sized wrapper in Photoshop and a HUGE one and neither one seem to change the width once it's linked up in blogger.

I'm thinking I need specific dimensions for the wrapper but I'm at a complete loss.

Can any of you experts help a girl out? TIA!