Get a root explorer, I use Root Explorer, it is a paid app, and totally worth it if you are rooted. I am not sure what free options are good, so ask around. My boyfriend was using File Expert, but it did not work very well, he finally bought Root Explorer, and he hasn't had a problem since.
Open the root explorer or file manager that you have, make sure you have R/W (read/write) privileges. Then look for the folder named system, in that folder you will find another folder named framework, inside that folder you will find a file named framework-res.apk , and another file named com.htc.resources.apk. When you see one of those files you long press on it, and a menu will pop up asking what you want to do with the file. You can choose copy, and then paste in on the root of your sd card, but I choose the option to send, and I send it to my dropbox. Then go to the system folder again, and look for a folder named app, inside that folder you will find SystemUI.apk , also copy that one to your sd card, or send it to your dropbox. Once you have those 3 files on your sd card, or in your dropbox, move them to your computer. Open the UOT Kitchen, make your modifications, then click on the tab that says file upload. On the right of the page there will be some options to "Select your rom from kitchen's list, or upload your own files" Choose upload system files. 4 boxes to upload files will pop up, only use the top 3. Click the select file button, and find the file that they are asking for by that button, then upload it. When all 3 files are uploaded, and you have made the modifications that you want then click the summary tab, it will have a summary of what you did, and a button at the bottom to submit your work. After you press it it will give you an order number, copy that down. Under your order number there will be a link to go to the pick up page, click it, and wait for your order to show up. Then download your order, and it will be a flashable zip, flash it and enjoy.