You can only transfer NFTs owned by your Cent address - the magiclink wallet created for your account on sign up with email. Any transfers of NFTs owned by an external wallet must be handled outside of Cent.

To transfer NFTs go to "View my collection" and press the two arrows [⇆] that are at the bottom of the digital collectible you want to transfer. From there a box will pop up and you can enter in your wallet address and hit transfer. This will initiate a transfer of your NFTs into your personal wallet address.