To search for media that meet your needs, simply go to the catalogue at the top of your Advertiser account.
Then use the search engine to define your requirements.
You can choose whether your searches are for SEO or Branding offers, and these two options will allow you to use different types of filters to meet your needs. The "advanced filters" section allows you to refine your search even further, to include offers with or without visibility levers, current promotions, niche themes, etc.
You can put offers in your basket or select them into a wishlist to find them later.