Is there a signature there I am not seeing?

No, unfortunately isn't present, it is the first page of the letter

Then how do you know it's from Lenin?

For easier viewing:

I know some history of this letter, but now still under examination

Actually, you should get in touch with a real appraiser or auction house. This could be of interest to the right collector. I don't know anyone personally, but you can find contact information for Bonhams, Christies, etc. online.

if you can somehow me more, because not much versed in the English sites and I use a translator, I am sorry for my english

I'm working on learning Russian and I noticed the writing on the top left corner done in pencil. It says Ã"ÃÂÃÂ (FOR) then another word. Any idea what this second word means?

So it's a letter, handwritten letter, from Stalin but wasn't signed?