Why can't I chage the mesh type on my Market Place listings? "no mesh" is the option others are grey

[JEZZIXA Cazalet]

This is a product description line. Choices are no mesh, partial mesh, mesh, fitted mesh to help describe what you are selling in the listing.  Why can't I chage the mesh type on my Market Place listings? "no mesh" is the option others are grey and can not be clicked.  This field is visible in the edit function of a listing.  Thanks for any help with this matter.

[Lindal Kidd]

You may not be authorized to upload Mesh.  To do so, you have to have payment info on file, and take a short tutorial and quiz on intellectual property laws.  See this link:  https://secondlife.com/my/account/ip/index.php