Using 1 picture for a lot of products.

[lat9]

Did you use your Zen Cart admin's header-menu to view those categories?

[greatgap]

I don't know what that is.

[lat9]

When you log into your Zen Cart admin, there's a menu across the top of the page: Configuration / Catalog / Modules / ...

Click on Categories, then click on Categories / Products (the spot where you add/edit your categories and products).

[greatgap]

Ok where is the category ID located then.

[lat9]

It's in the ID column on the far left of the categories listing.

[greatgap]

Ok so the ID is 1, what now?

[lat9]

OK. First ... make a backup copy of your database.

Once you've got that backup, use the links in your Zen Cart admin's menu to navigate to Tools->Install SQL Patches.

Copy/paste the block below into that form and click the "Send" button:

UPDATE products SET products_image = 'Air.jpg' WHERE master_categories_id = 1;

[greatgap]

Everytime I try to use it it just tells me I need to refresh the page.

[lat9]

That message indicates that there's a debug-log file created in your store's /logs directory named myDEBUG-adm-*.log. That file will contain the name of your "secret admin directory", so be sure to remove that prior to posting the log's contents using the "CODE" tag (the big # in the upper menu-bar when you're writing a post).