To add a customized code in html, php, java or add seals or any third party coding to a page in soholaunch simply open notepad, copy and paste your codes to notepad.
Go to File, Save As, change the bottom window to all files... and type in the name of your code. IE:
The word custom can be anything you want it to be.
Go to your soho page, edit, instead of dragging a text editor to the page, use the CUSTOM CODE icon right next to the SHOPPING icon on the top right of your menu bar.
Select upload file, browse your hard drive, select the file, click upload.
Now look in your custom file dropdown, select your file there... click the ok and your script is now on the page!
Save page and view. Continuing editing whatever else you want on the page in the normal manner.