Can't pass connection from one form to another

Hi everyone,

I'm completely stuck at passing the connection info from my login form to my main form. The program should:

- Connect to the remote MySQL DB
- Fetch a list of usernames so the user select his/her
- Validate the user's password with the MD5 password stored in the DB
- If the user and password matches, show the main form
- Open the main form having the connection stablished (this is the problem)

I attached two TXT files with both forms to see if anyone can help me with this.

Thanks a lot in advanced!!
login.txt
main.txt