No, unfortunately you can't do it by yourself. remember that a product page is shared between all the merchants whom put a listing on it, therefore you can't modify the attribute/title or description of an existing product.
But in case of a modification resquest : In order to ease the product modification process, whose responsibility is upon Catalog Team, the request should now be addressed either through your Account manager that will report it.
Or by filling up this form : https://forms.gle/MMeSPou9UtpTcxXL9
Catalog team will provide you a technical assistance concerning your request.
For CSV update you can send directly your update request to : firstname.lastname@example.org.
But please make sure you provide :
- Product name + Back Market ID
- SKU and Merchant name
- Details of the problem ( The wrong information and the update suggested )