I have followed these steps:
1)Installed electron cash on a computer that doesn't have your Bitcoin wallet or any information about your Bitcoin.
2) When you get to the option to select new wallet etc. Select you have a existing seed or master seed. This is your list of twelve words that you got when you did a backup of your Mycelium wallet
Type the words in with spaces. Example "one two three four five six seven eight nine ten eleven twelve"
You'll notice that the next box in the lower rightbcorner is greyed out
Click the Options box. Put a check in the BIP138 box
Now the next box is available. Click next and when the wallet connects to the Bitcoin cash server you will see your Bitcoin cash balance.
After following all these steps, my bitcoin cash balance is showing as 0. Is there something wrong I am doing? How I can know, it has connected to MyCelium wallet?
Did your instance of Electron Cash start up on the right block chain? Follow this guide to be sure (as of this post the BCC block height is 478609 vs 478918 for BTC):
https://www.reddit.com/r/btc/comments/6qyn18/electroncash_notice_how_to_select_bitcoincash/I tried above steps. Nothing works. Block Height is 478610
Hmm. Have you tried installing regular Electrum (for legacy Bitcoin (BTC)) on another computer and putting in that seed to see if the correct BTC balance shows up? If it does, I'm out of my depth. I can only tell you my experience with Electron Cash worked without problems.
If you try that and you get a zero BTC balance, I think that implies you have the wrong seed, because the one you've been trying is likely empty.