How to become GM, IM etc on Chess.com?

It's simple. Chess.com doesn't award titles. Some titles are awarded by national federations. Others like IM and GM are awarded by FIDE, the international chess federation.
To get an IM or GM title:
- Play in several FIDE (the international chess federation) over the board tournaments with a bunch of IM's and GM's.
- Score enough points in the tournaments to achieve a "norm" based on the number and strength of titled players in the tournament.
Once you do that and get your title from FIDE, just send a copy to chess.com and prove you are the person who earned the title.
As I said, Chess.com doesn't award titles. They just give free membership to people who have them. Free membership is available to lower titles down to Fide candidate master. Some nationally awarded titles also qualify.
Good luck!
Possibly of interest:
https://www.chess.com/article/view/can-anyone-be-an-im-or-gm
What It Takes to Become a Chess Master by Andrew Soltis
https://web.archive.org/web/20140708093409/http://www.chesscafe.com/text/review857.pdf
100 Chess Master Trade Secrets by Andrew Soltis
https://web.archive.org/web/20140708094523/http://www.chesscafe.com/text/review916.pdf
Reaching the Top?! by Peter Kurzdorfer
http://www.thechessmind.net/blog/2015/11/16/book-notice-kurzdorfers-reaching-the-top.html
http://www.jeremysilman.com/shop/pc/Reaching-the-Top-77p3905.htm
What It Takes to Become a Grandmaster by GM Andrew Soltis
https://www.chess.com/article/view/don-t-worry-about-your-rating
https://www.chess.com/article/view/am-i-too-old-for-chess

To get GM or IM by your chess.com name, you need the FIDE title in real life. Then you send chess.com e.g. a photo of yourself with a photo ID proving your real name. Then they look to see if your real name is listed e.g. on FIDE as having the GM title.
To get FIDE titles (like IM and GM) you have to play in FIDE rated events which are OTB (over the board) chess i.e. not online.

Usually men with less than 2200 Elo FIDE don't have titles.
Simple fix: identify as a woman when playing for an easy title (assuming you have the skill to actually get to that fide rating lol)
4 years later and still rated 1400 online. I guess you lost interest shortly after this post. This is why this type of posts online shouldn't be taken seriously. lol
You have to start young...try next life.
I started at 18 is that fine?
in your case no. its not. you are never going to be a titled chess player.

I am 16 is that ok? I am rated nearly 1200 now
You can't get the title if you're only playing Chess.com