It seems you have not set your Profile Delivery Charges yet. You can not sell or add more items until adding your Local and International delivery charges.
Profile Delivery Charges gives you facility to add delivery charges by Buyer's country and Format wise.
Once you set your profile delivery charges Local and International that will get used as Delivery charges for your collection items.

Click here to set Delivery charges Local and International.

It seems you have not set your Profile Tracked or signed carrier rates yet. You can not sell or add more items until adding your Local Tracked or signed carrier rates.
Profile Tracked or signed carrier rates gives you facility to add delivery charges by Format wise.
Once you set your profile Tracked or signed carrier rates that will get used as Delivery charges for your collection items for some marketplaces.

Click here to set Local Tracked or signed carrier rates.