Can't copy files to my "My book Live"

Got a new computer the other day with Windows 10 and I can connect to my WB My Book Live P/N WCC1T1461847 without any problems. I’ve ownloaded files from it to my computer but problems started when I wanted to copy a file from my local computer to my share on the My Book Live. Whenever i start a copy process computer responds that i have no access to copy files to it. I have activated SMB 1.0 so it’s not that.

can anyone please help me out with this??

Thank you!