Once I've completed the grid and entered my name and address, I take a photo of it, on my ipad and then email it to the telegraph, via their "puzzles.telegraph.co.uk" address. But you must add the title, e.g.
"DT ...... " or Sunday Cryptic ...." other wise, apparently, they won't accept the entry. They seem to have stopped the feature so you can send it directly to them online ...