From what I’ve seen as I work my way through the thesis forums it appears a lot of people have trouble finding their custom.css and custom_function.php files to make changes. This is a simple matter to resolve if you follow these simple steps. This is the the routine I practice and it works great…
First things you’re going to need are the proper tools. Most computers have a basic text editor on their computer. This will work fine but I highly recommend downloading the free web developer program Aptana Studio . It’s by far the best text editor in the biz. It’s free, it’s easy to use, it has great customer support, it finds mistakes as you write your code, multi-colored code, too much more to list. Click on the link and check it out yourself.
Next you’re going to need an ftp program to upload your edited custom files to your server. Most hosting companies have this at your disposal.
When I first downloaded thesis to my computer I downloaded it to my desktop just to make it easy to find. Once I opened up the folder I found my custom.css and custom_fucntion.php files here in the custom file:

I simply copied the custom files right to my desktop so it’s easy to find.
Next I open my text editor, in this case, Aptana Studio, and I open the custom.css file.
I make my changes and save the file as custom.css or custom_function.php. (Don’t change the name)
Once you installed Thesis on your server you go to your ftp program of choice and depending on what directory you installed Thesis to you’re going to eventually find the path that looks like this:

When you upload your edited version of the file the ftp program will probably ask you something along the line of “custom.css (or custom_functions.php) already exists. Would you like to overwrite the file?” Click “yes” and it will upload it. You now have your newly edited custom file on your server.
Check out your site, hit the refresh button, and you should now see your changes.











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