Hi Moushira,
You and others can access superset by:
1) making sure that you have a signed NDA on file. Reach out to legal if you don't or if you aren't sure so that they can confirm
2) setting up an LDAP (aka wiki tech aka developer) account. Go to https://wikitech.wikimedia.org/wiki/Main_Page and click on create an account on the top right 'create account' link. You will need to know your shell user name. If you don't know what this is, take the following steps:
a) use Finder to open Terminal
b) type
`echo "$USER"`
OR
`whoami`
c) copy the shell user name that is listed
Once the account is set up, you can request access.
Here's a sample access ticket T160662 request (the access here includes access to superset).
There's a training coming up on Jan 22, 2020, carried out by product analytics, which will be recorded. I can share that recording link when it is available.