Drag and drop

You can drag and drop a cell to a field.

Clipboard

You can copy the password/user to the clipboard using shortcuts CTRL+P/CTRL+U or the menu items.

Smart Copy

It is possible to use the smart copy which copy the last selected cell. For example if you click on the second line in the password column, the password of the second entry will be copied to the clipboard if you press CTRL+C or the smart copy menu item.