Your instruction is not the way to add a token as a default token in the main MEW list. It is only for the personal reference; so your friends won't find the symbol from the official MEW token list.

Here is the link for the detailed instruction about how to list a token as a default token on MEW:
https://myetherwallet.github.io/knowledge-base/tokens/token-creators-add-your-token-to-myetherwallet.html