O.P. Also, If you cannot log into CWP user interface at all, then you would need to use SSH program such as Putty to log into the command shell backend of your server and check users from there.
for example...from command shell in Putty you could type
less /etc/passwd
or
awk -F: '{ print $1}' /etc/passwd (this shows just the usernames)
or
cut -d: -f1 /etc/passwd (also shows just usernames)
or
getent passwd
or
getent passwd | cut -d: -f1
If you want to just check for a particular user on your system...
getent passwd | grep username (where username is the user you are looking for...ie admin )
Once you have an account that can log in, then you may check packages for that user by...
CWP dashboard>User Accounts>Edit Account (little cog on RHS of user list)...
under "Account Edit", you can check/select "Package"
If there are none in this list, then you need to create them under dashboard>packages (there should at least be a default package in list)