To convert your web/email domain into a Lightning Address using Alby, you can follow these steps:

Go to the Alby website (https://alby.io/) and click on the "Sign Up" button to create an account. You will need to provide your email address and set a password to create an account.

Once you have created an account, log in to the Alby dashboard.

In the dashboard, click on the "Lightning Addresses" tab on the left-hand side of the screen.

Click on the "Create a New Address" button.

In the "Lightning Address" field, enter your desired domain name or email address. For example, if your email address is john@example.com, you could enter "john@example.com.alby.to" as your Lightning Address.

Select the Lightning Network node you want to use from the dropdown list. You can choose from the available nodes listed on the Alby dashboard.

Click on the "Create" button to generate your Lightning Address.

Once your Lightning Address is created, you can use it to receive Lightning Network payments from other users. You can share your Lightning Address with others by including it in your email signature or on your website.

It is important to note that while Alby provides a convenient way to create Lightning Addresses, you should still exercise caution when using Lightning Network services and transacting with cryptocurrencies. Always do your own research and make sure to take appropriate security measures to protect your funds.