The quick answer for here, so nobody has to go searching, is to just set the format property of the text box to PASSWORD. If you type the word "Password" into the Format property it will then mask the password.
To hide the password in the table set the input mask to password.
However, you can still copy and paste the data into another location and it will paste the actual password. To keep it completely inaccessible, you would need to implement security to keep people from the table, or encrypt the password before storing it.