388221 vBulletin4 user login problem

I imported the user table manually from my existing website's db to vbulletin4. 'salt' column was also created using 3 random characters. It shows the user accounts in AdminCP, but doesn't show the userID with the "Edit" links (userID is defined in the table though). And, users are not even able to login. What I need you to do: Fix the issue while keeping the same userIDs. Please Note: You must have experience with vbulletin and its database.