Create new account
from the small plus icon in the top right. The Polkadot{.js} plugin will then use system randomness to make a new seed for you and display it to you in the form of twelve words.Add account menu
by selecting Import account from pre-existing seed.
Next step.
account with the generated seed.
Polkadot Relay Chain.
Create Account.
Next
.Next
.Next
when completed.