Hello @rodneymiskin1,
Welcome to the LastPass Community!
If you want to manually save an item to LastPass you will need to go to Vault > In the bottom right corner, select the red bubble with the + sign > then choose password > it will give you the option to add the URL you want. You can find more here: Add a password in LastPass.
About your other question when you mean a code provided by the website is this a TOTP code? At the moment the option is only available for Teams and Business accounts I apologize. You can find the information about TOTP here: Create a TOTP for password items in your LastPass vault
Kind Regards,
Alejandra
LastPass Support