In order to add a KeePass entry to LastPass:

1. Modify the KeePass group that contains the password entry
2. On the Autotype tab, enter the following (Replacing the Folder names if required): {URL}{TAB}{Title}{TAB}Folder1\Folder2{TAB}{UserName}{TAB}{Password}{TAB}{TAB}{TAB}{TAB}{TAB}{ENTER}
3. Save the changes to the group
4. Open LastPass Vault and select 'Add Site'
5. Wait for the browser to load, then with the first field selected (URL), switch to KeePass
6. Press CTRL + V

This will autotype the KeePass entry details into the LastPass browser window for you.