When you click on Creatives > Live Creatives, you can check multiple brand's creatives available on the dashboard. You can also search for a specific brand's creatives by using filters.
Click On View Code.
A window will appear on the screen you can either copy code or right click on the image and save creative to use.
You can also request for your Exclusive code creative. Go to Creatives > Creative Requests > Request New.
A window will appear, you can select offer/ campaign you want for creatives.
For generic creative request you don't need to put description but if you want partner-specific creatives kindly put your requirement of dimension in the description box.