Draft letters

[Cliff]

I saved a draft letter but am unable to find it. Help!!

[GreenLake]

Assuming this was a saved draft of a reply: Go to the topic to which you replied. Reply again and there will be a new button below to load a draft. That brings up a list from which you can select your saved draft.

Saving a draft of a first post in a new topic is
similar, but you have to start a new topic again in the same place to be offered to load your draft.

If by "letter" you mean a direct message, you'd have to experiment a bit. They share some similarities with posts and topics so i might work in a similar way.