How do I add a new account if I already have one in the wallet?

So, I generated a wallet using `zli wallet init` command.
I'd like to check if I can make transfers, so I thought I would create a new account and transfer some ZILs between my own accounts.

`./zli account generate` did not work for me, it just prints
```
start to generate  2  accounts
end generate  2  accounts
```
But `.zilliqa` file stays the same.