Install the following packages:
apt-get install samba-common smbclient samba-common-bin smbclient cifs-utils
Create a local directory:
Mount the Samba share using your username:
mount -t cifs //server/share /mnt/abc -o user=uwe
If the Samba share is provided by a FritzBox via its NAS feature and assuming the share is named "MyNAS" on your FritzBox, then the above command would be:
mount -t cifs //<FritzBox IP>/MyNAS /mnt/abc -o user=uwe
Based on this SO answer.