i usually type in “mybooklive\Agustin” then my password in the next box and hit enter, you might also want to double check the permissions.
if all else fails try using the command prompt
CTRL+R
cmd
net use \mybooklive passwordhere /user:username (if you renamed your mbl enter the name you put instead of mybooklive)
that should do it try opening your share again
if you want to map a share while you add it type in:
net use n: \mybooklive\share (share with your private share)