Here is the starting page for Geocities. It invites you to sign in or to establish a new membership. Here is Geocities' starting link
The second page welcomes you and asks you what you want to do. Since you have already created your web page, you want the "File Manager" link. The File Manager makes it VERY EASY to transfer your web page files to the Geocities server. Once you've completed teh transfer, you are in business!
The first "File Manager" screen has the file name defaults, which are the ones you want to use. Click on the "Open File Manager" link to proceed.
The File Manager screen lists all of the files in your directory. It will initially have only one file - "Index.html". Your main page will replace this index page. Remember, your main page MUST be named "index.html". The first action you need to take is to delete the current index file so your index file will take it's place when you upload it. Click on the "Upload Files" button to begin the upload procedure. Don't worry, you can't hurt anything and you can always start over if you get confused.
You specify the file names that comprise your web page. You can have any number of documents in your web page. Click on the "Upload Files" button to upload the files to the server.