[Fυcĸleѕѕ]

Just editing this logo in Photoshop doesn't make it bigger on the website. Is there something I need to do in the HTML or CSS to allow it to be bigger?

http://www.ambercourtal.com/

[ElasticWeed]

Set width and height tags on the object.

Either in-line (not to be used for actual production version of website, but might help you to see if there's any underlaying problem with the website)

Code

<img src="picture.png" alt="Text about image" height="100" width="200">

For CSS, use the following.

Code

.TagName {
    height: 100px;
    width: 100px;
}

Edit: Just realised you're using WP. The same solution does of course still work, but might need a bit more troubleshooting to make it work well with your template.