Magento errors

1. The clients don't receive email from shop after they place the order. Also where I can edit the text which appear on the website when client place the order? 2. Screenshot 1 3. Screenshot 2 4. Screenshot 3 5. Screenshot 4 6. Screenshot 5 7. I can log in to the forum. My old admin password don't work 8. I need to change graphic on the forum thats look the same as [login to view URL] 9. Screenshot 6 10. I have a error on page: [login to view URL] 11. I had 3 datebase errors on forum: Database error in vBulletin : mysqli_real_connect(): (HY000/2002): Can't connect to local MySQL server through socket '/var/lib/mysql/[login to view URL]' (2) /home/doktorpo/public_html/[login to view URL] on line 1358 MySQL Error : Error Number : Request Date : Thursday, March 30th 2017 @ 11:06:00 AM Error Date : Thursday, March 30th 2017 @ 11:06:01 AM Script : [login to view URL] Referrer : [login to view URL] IP Address : [login to view URL] Username : Classname : vB_Database_MySQLi MySQL Version : Database error in vBulletin 4.2.2: Invalid SQL: DELETE FROM `aitmagentovb_hash` WHERE `hashid`=56257; MySQL Error : MySQL server has gone away Error Number : 2006 Request Date : Tuesday, April 4th 2017 @ 04:09:34 AM Error Date : Tuesday, April 4th 2017 @ 04:10:12 AM Script : [login to view URL] Referrer : [login to view URL] IP Address : 2a07:4e80::ec4:7aff:feab:cbad Username : Unregistered Classname : vB_Database_MySQLi MySQL Version : Database error in vBulletin 4.2.2: Invalid SQL: DELETE FROM `aitmagentovb_hash` WHERE LENGTH(`hash`) != 36 OR `validthru` < NOW() OR `created_by` NOT IN ("mage", "vbul"); MySQL Error : Table './doktorpo_forms/aitmagentovb_hash' is marked as crashed and should be repaired Error Number : 145 Request Date : Thursday, April 6th 2017 @ 02:25:59 PM Error Date : Thursday, April 6th 2017 @ 02:25:59 PM Script : [login to view URL] Referrer : [login to view URL] IP Address : [login to view URL] Username : Classname : vB_Database_MySQLi MySQL Version :