Im on my own---help

Im trying to alter the description in my in Catologue.as set up by my web guys.
In there there are varying size font and different colours

When I go there I cannot alter the size of the font ? All seems preset
Any idea

Thanks

Start with version and theme. The title you have is useless, edit it so that a Moderator won't see it and vent. "How do I edit categories and products?" would bring chuckles, but at least it would be useful as an indexed title.

In admin go into Catalog / Categories and into Catalog / Products. Bring up a category. Look at it. Then so as not to destroy what was already done before you understand any of it, hit Insert to make up a product and see how that works. While tinkering you will need to Enable it so that you can see it in the storefront. Bring up a product -- all ditto.

Each category and product description occurs in an editing box. If you know what you are doing, then you will want to toggle that box into Source mode while you edit and Save. If you have no clue, then you will want to toggle that box into wysiwyg mode so that you can fiddle with fonts and colors and whatnot. There is a button labeled Source just off the top left corner of that box. Type something into the box. Toggle that button. Look to the right of that button and you will see all manner of choices laid out as an array of little buttons. Poke and explore.