The first thing you must do is create an uploading account on the site, which can be made by clicking ‘Manage Uploaded Files’ and after that it should be quite self explanatory.
The next thing you must do to be able to upload files is an upload client. You can survive with using IE to upload files but I wouldn’t recommend it. You can download the one I use here. http://filezilla.sourceforge.net/
Download the normal ‘Filezilla’ you don’t have to download the server version of it.
After installing it, you must run it. In the bar on the top, input the address, username and password and click quickconnect.
Address: ftp.classic-gaming.net
Username: Whatever you put in when you registered your upload account. For me it would be dragonman4.
Password: Whatever you put in when you registered your upload account.
Now that you are logged in you should see something like this.
When you have successfully logged in, browse around using Filezilla and access the folder where the file you want to upload is in.
Double click on the ‘submissions’ folder. Since this is your first time there would be nothing in there. Now all you have to do is drag and drop the file you want to upload. After you have dropped the file into the submission folder you should be able to see your file being uploaded at the bottom of the client.
You can pause the upload by right-clicking and selecting ‘pause’. If you leave Filezilla after you paused it and then go back in, all you have to do is right click the file you are uploading and then select ‘Process Queue’. A new window will open. Select ‘Resume’ and then go to OK.
After you have completed uploading you must submit the file you uploaded so that it can be moderated and then added to the site.
Note: Uploading in other clients is generally the same
*UPDATED*
I thought I might as well include a submitting tutorial since some people have been having trouble with submitting.
Ok first off click the 'Submit Content' button on the side of your screen.
A screen should come up similiar to the one below. If another one comes up it means that the submissions are full (100 unmoderated entries) or the submission system is down.
Ok first, before you can submit the actual game file you have to submit the game information. This can be done by clicking 'Game'. When you've done that a screen like this should come up.
Now fill in the necessary information
Name: The name of the Game
Official Site: Some old games' Official Site's might be dead so you might want to put a link to a Wikipedia or Mobygame entry.
Links: Any additional links
System: What system the game belongs to
Genre: What is the games genre
Developer: The games developer. If CGN doesn't have an entry for the game company you should add one by going back to the first submission page and clicking 'Game Company'
Publisher: The game publisher. If CGN doesn't have an entry for the game company you should add one by going back to the first submission page and clicking 'Game Company'
Year: The year the game was released
Ok. Hopefully you had no trouble with that. Next go back to the 'Submit Content' page and select 'Download' or 'CD ISO'. This will allow you to submit your game file.
A screen like the one below should now be in front of you
http://img162.imageshack.us/img162/5530/sub43vo.png
Select your system and keep on moving. The next screen should have a list of game pages that are on the site. Select your game and a screen similiar to the one below should pop up. Your page should have the game file on the page with a checkbox next to it. Like the one below.
http://img404.imageshack.us/img404/5841/sub77bv.png
Now all you have to do is check the box and click submit. It will then be in time moderated and added to the site.
Note: Submitting screenshots, reviews etc. are pretty self explanatory and I'm sure you can figure out how to do them on your own