TOPIC: Editing my Header block

I can't seem to be able to edit or change my header block. I want to change the appearance of my logo, but however I upload the image of my new logo, the website header logo remains the same. What am I doing wrong? Thanks.

In fact, when I brought up the logo image in my theme menu, a picture that is not on my header block shows up. I don't know how it gets there.

Leon

I got it to work. It seems the previous image was not the right size, which is why it didn't show onsite. Thanks

That would do it. Also make sure to right click, hold shift and click refresh to force pages to download all files again and get the latest version of the site from the internet.