Should I resign here? Or does black has resources to save the game?

Should you resign?  If it's an active game, we can't tell you.

Try 1...Rd4; if 2.QxR, then 2...Re1+ 3.Kh2 Rh1+ etc.
If not, then perhaps Rg4 to defend g7 or Red8 (personal reflexion...) 

You can't ask for help in the middle of an active game.

Why are you helping a player in the middle of a game?

Do you realize that you aren't allowed to do such a thing?

- the OP doesn't have any ongoing games

- this is the puzzles forum

If you do something illegal, such as crossing a red light while driving, you can say that you "felt like it", but it's still illegal. The same applies here. In correspondence games, you can get help from books and databases. That's all. You can't use engines or get help from strong players.

Sorry, I was mistaken... Since the word "resign" was used, I thought it was an active game.

I am sincerely sorry for helping other players, since I did not know that was illegal. I have deleted the solutions and I will never post them again.

Fortunately the player asking for help did not see my solutions yet.

P.S. One of ChessPatzer987's comments contains my solution. So please do something about it.

Okay, I was completely mistaken. I apologize. Here's the solution.

I was mistaken. I apologize. KeyserSzoze didn't have any active game. (However, if a player asks for help in the middle of an active game, you aren't allowed to help.)

Why? It's his job to know the rules. You never know, he might play a correspondence game on some other site and ask for help here.

I guess you have a point...

Sorry for some misunderstanding for the last few comments. This is not an active game, and I would like to repost my solution below.