I finally got it and it works like i vant. Thank you soo much. 
But i a nuw trouble. If a made a closed survey, i can't invite participants. I add a survey participants, then i choose a person who i want to invite, check a box in front of his name, click the pick-up menu "selected participant (s)" - "sent an invitation" - in the next window i see the inviting message and list of invitees and click "send invitation". Then appears next notification :

• having a valid email address
• not having been sent an invitation already
• not having already completed the survey
• having an access code
• having at least one use left

I don't understand why this happen. Email settings are configured. The test email is sent correctly. The participant has an "email" filled in. Also i can't send email from central database.

p.s I can't add any attachment here, because here is only message window and captcha.

1. This is a completely different issue and should go into its own thread.

2. You still didn't tell us what Limesurvey version you are using. If I recall right, there was a version a couple of weeks / months ago, that had an issue with emails being considered not eligible. So if you are running an older version, this might be your case as well. No guarantee though.