Owners and tenants can log into their portion of the web site via the Member Login link on the home page of the web site.
When they log in, the company name on the login screen is the same name you use to log in as a property manager. Initially the tenant and the landlord will both need to use their short code as both the login name and the password. They can both change their passwords later if required.
The mail merge facility has a special field called the Web Login URL field. This will generate a special link which you can provide to your landlords and tenants which already contains your company name and their short code. This link is specific to an individual owner or tenant. See the Mail Merge facility for more information.