How to Send an Account's Email Login/Password from Accounts Page
From the left navigation menu, click Org or Team Tools > Accounts.
Select the Account(s) you would like to send login information too.
Click Communicate > Email Login or Email Password Reset.
Click Send to confirm you'd like to send the login instructions to the selected accounts.
How to Send an Account's Email Login from an Individual Account
From the left navigation menu, click Org or Team Tools > Accounts.
Click on the "Last Name" of the desired account.
On the right-hand side of the popup screen, click Email Login Instructions or Email Password Reset > Click Again to Confirm.
After confirming, you will see a green Instructions Sent.