Yes, you can create admin users other than initial one ("Superuser" permission). You can create users who are able to create and edit surveys ("Surveys" permission).
Go into the email settings of the backend and configure it correctly. See what method is currently used (probably PHP). I would recommend to go for SMTP, I think it causes less trouble.
Set up the email account you want to sent emails from. I think it is quite selfexplanatory and depends heavily on your email provider, so there is not much we can help.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.